Journal articles: 'Metal complexes Coordination compounds'

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Salzer, A. "Nomenclature of Organometallic Compounds of the Transition Elements (IUPAC Recommendations 1999)." Pure and Applied Chemistry 71, no. 8 (August 30, 1999): 1557–85. http://dx.doi.org/10.1351/pac199971081557.

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Organometallic compounds are defined as containing at least one metal-carbon bond between an organic molecule, ion, or radical and a metal. Organometallic nomenclature therefore usually combines the nomenclature of organic chemisty and that of coordination chemistry. Provisional rules outlining nomenclature for such compounds are found both in Nomenclature of Organic Chemistry, 1979 and in Nomenclature of Inorganic Chemistry, 1990This document describes the nomenclature for organometallic compounds of the transition elements, that is compounds with metal-carbon single bonds, metal-carbon multiple bonds as well as complexes with unsaturated molecules (metal-p-complexes).Organometallic compounds are considered to be produced by addition reactions and so they are named on an addition principle. The name therefore is built around the central metal atom name. Organic ligand names are derived according to the rules of organic chemistry with appropriate endings to indicate the different bonding modes. To designate the points of attachment of ligands in more complicated structures, the h, k, and m-notations are used. The final section deals with the abbreviated nomenclature for metallocenes and their derivatives.ContentsIntroduction Systems of Nomenclature2.1 Binary type nomenclature 2.2 Substitutive nomenlcature 2.3 Coordination nomenclature Coordination Nomenclature3.1 General definitions of coordination chemistry 3.2 Oxidation numbers and net charges 3.3 Formulae and names for coordination compounds Nomenclature for Organometallic Compounds of Transition Metals 4.1 Valence-electron-numbers and the 18-valence-electron-rule 4.2 Ligand names 4.2.1 Ligands coordinating by one metal-carbon single bond 4.2.2 Ligands coordinating by several metal-carbon single bonds 4.2.3 Ligands coordinating by metal-carbon multiple bonds 4.2.4 Complexes with unsaturated molecules or groups 4.3 Metallocene nomenclature

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Gupta, P. K., Dinesh Kumar, and Amit Kumar. "Preparation and Spectroscopic Characterization of Polymer-Supported Transition Metal Complexes." Asian Journal of Chemistry 31, no. 9 (July 31, 2019): 2087–90. http://dx.doi.org/10.14233/ajchem.2019.22142.

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Novel polystyrene supported mixed Schiff base (PSCH2–LH2) and its coordination compounds with copper(II) and zirconium(IV) have been synthesized. PSCH2–LH2 has been synthesized by the reaction of chloromethylated polystyrene crosslinked with divinylbenzene (PSCH2–Cl) and the Schiff base (LH2) derived from 3-formylsalicylic acid, propylenediamine and acetylacetone. The polystyrene supported coordination compounds are of the types: [PSCH2–LCu] and [PSCH2–LZr(OH)2·DMF]. They have been synthesized by the reaction of PSCH2–LH2 and the metal salt in DMF. The coordination compounds have been characterized on the basis of elemental analyses, IR, reflectance, ESR spectral and magnetic susceptibility measurements. The shifts of the ν(C=N) (azomethine), ν(C–O) (phenolic) and ν(C–O) (enolic) stretches indicate the ONNO donor behaviour of PSCH2–LH2. The polystyrene supported Cu(II) compound is square planar and Zr(IV) compound is pentagonal bipyramidal. The coordinated solvent molecules are completely lost from metal bound coordination compound by heating them at definite temperature in an air oven for 3 h. The compound, PSCH2–LCu is paramagnetic, while PSCH2–LZr(OH)2·DMF is diamagnetic.

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Beldon, Patrick J., Sebastian Henke, Bartomeu Monserrat, Satoshi Tominaka, Norbert Stock, and Anthony K. Cheetham. "Transition metal coordination complexes of chrysazin." CrystEngComm 18, no. 27 (2016): 5121–29. http://dx.doi.org/10.1039/c5ce00792e.

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Eleven novel coordination compounds, composed of chrysazin (1,8-dihydroxyanthraquinone) and different first-row transition metals (Fe, Co, Ni, Cu), were synthesised and the structures determined by single-crystal X-ray diffraction.

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Alsayeed, Raghda, Dalia Mahmood Jamil, Huda Ghalib Salman, and Mohammed H. Al-Mashhadani. "Synthesis of Novel Trimethoprim Complexes and Their Analysis by Ultraviolet Derivative Spectroscopy." Materials Science Forum 1021 (February 2021): 200–209. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.200.

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In this research, the actions of antibiotic trimethoprim alone and with metals combained. Then assayed through formation of base transition metal compounds as ligands have the chance to achieve an unusual arrangement and stability complexes of coordination. We show advancement in using transtional metal compounds medications for treamentt manyl human illnesses such as carcinomas, lymphomas, control of infections, anti-inflammatory disorders, diabetes, with neurological conditions. This combination with transition metal observed the interaction can be separated by derivative spectroscopic method and measure the characterization of compound by IR and UV spectroscopy.

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Kumar, Amit, Praveen Kumar Gupta, Sunil Kumar, and Dinesh Kumar. "Immobilised nickel(II), dioxomolybdenum(VI) and dioxouranium(VI) complexes on polystyrene resin." Journal of University of Shanghai for Science and Technology 23, no. 06 (June 18, 2021): 11201–1127. http://dx.doi.org/10.51201/jusst/21/05362.

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New polystyrene supported mixed Schiff bases(PSCH 2 –LH 2 ) and their coordination compounds with nickel(II), dioxomolybdenum(VI), and dioxouranium(VI) have been synthesized. PSCH 2 –LH 2 have been synthesized by the reaction of chloromethylated polystyrene crosslinked with divinylbenzene(PSCH 2 –Cl) and the Schiff bases(LH 2 ) derived from 3-formylsalicylic acid, ethylenediamine or propylene diamine, and acetylacetone. The polystyrene-supported coordination compounds are of the types: PSCH 2 –LM(where M = Ni, MoO 2, UO 2 ). They have been synthesized by the reaction of PSCH 2 –LH 2 and the metal salt/metal coordination compounds in DMF. The coordination compounds have been characterized on the basis of elemental analyses, IR, reflectance, and magnetic susceptibility measurements. The shifts of the ν (C=N)(azomethine), ν (C–O)(phenolic) and ν (C–O)(enolic) stretches indicate the ONNO donor behavior of PSCH 2 –LH 2. The polystyrene-supported Ni(II) compound is square planar; MoO2 (VI) and UO2 (VI) compounds are octahedral and Zr(IV) compounds are pentagonal bipyramidal. The compounds, PSCH 2 –LM(where M = Ni, MoO 2, and UO 2 ) are diamagnetic.

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Assi, Hala, Georges Mouchaham, Nathalie Steunou, Thomas Devic, and Christian Serre. "Titanium coordination compounds: from discrete metal complexes to metal–organic frameworks." Chemical Society Reviews 46, no. 11 (2017): 3431–52. http://dx.doi.org/10.1039/c7cs00001d.

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Cherkasova, Tatyana G., and Elizaveta V. Cherkasova. "Crystal Structures of Binuclear Coordination Rare-Earth Metal Compounds." Key Engineering Materials 670 (October 2015): 9–14. http://dx.doi.org/10.4028/www.scientific.net/kem.670.9.

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The double complex compounds - hexa (isothiocyanate) chromates (III) of lanthanide (III) complexes with ε-caprolactam and nicotinic acid [Ln (ε-C6H11NO)8][Cr (NCS)6] and [Ln (C5H5NCOO)3(H2O)2][Cr (NCS)6]·nH2O, n=1,2 - were produced from the aqueous solutions by means of direct synthesis. The substances are studied by the spectroscopic method; their crystal structure is determined. It is found that all the complexes are of island ionic type. ε-C6H11NO complexes form triclinic system crystals - space group P ̄1, or monoclinic - space group С2/с. The nicotinic acid compositions crystallize in the monoclinic system, space group P21/n. The complexes have reversible heat-sensitive properties and can serve as the chemical sensors in the temperature-sensitive devices that are used for visual inspection of the thermal regime in various technological processes.

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Benesperi, Iacopo, Reena Singh, and Marina Freitag. "Copper Coordination Complexes for Energy-Relevant Applications." Energies 13, no. 9 (May 2, 2020): 2198. http://dx.doi.org/10.3390/en13092198.

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Copper coordination complexes have emerged as a group of transition metal complexes that play important roles in solar energy conversion, utilization and storage, and have the potential to replace the quintessential commonly used transition metals, like Co, Pt, Ir and Ru as light sensitizers, redox mediators, electron donors and catalytic centers. The applications of copper coordination compounds in chemistry and energy related technologies are many and demonstrate their rightful place as sustainable, low toxicity and Earth-abundant alternative materials. In this perspective we show the most recent impact made by copper coordination complexes in dye-sensitized solar cells and other energy relevant applications.

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Melnik, Milan, Markku Rafael Sundberg, and Rolf Uggla. "Analysis of crystallographic and structural data of polymeric iron-alkaline metal complexes." Main Group Metal Chemistry 34, no. 5-6 (December 1, 2011): 93–126. http://dx.doi.org/10.1515/mgmc-2012-0900.

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Abstract The present review covers almost 100 polymeric MFe (M=Li, Na, K, Rb, and Cs) compounds. The metal atoms of group 1 as partners with iron atom build up complex polymeric chains. The iron atoms are found in the oxidation states 0, +2, and +3, of which the oxidation state +3 prevails. The coordination number of the iron atom ranges from 2 to 10 (sandwiched). The coordination sphere about the main group 1 metals varies, ranging from tetrahedral to mostly trigonal bipyramid. There are also higher coordination numbers involved, namely, from 6 to 10. The most common ligand atoms are oxygen and nitrogen. There are three compounds displaying distortion isomerism. Several relationships between structural parameters are found and discussed.

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Peni, Peni, Risya Sasri, and Imelda Hotmarisi Silalahi. "Synthesis of Metal–Curcumin Complex Compounds (M = Na⁺, Mg²⁺, Cu²⁺)." Jurnal Kimia Sains dan Aplikasi 23, no. 3 (March 20, 2020): 75–82. http://dx.doi.org/10.14710/jksa.23.3.75-82.

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Curcumin complex compound, MLn (L = curcumin; M = Na+, Mg2+, Cu2+) has been synthesized from the reaction between curcumin and metal precursors (NaCl, MgSO4.7H2O, CuCl2.2H2O) in ethanol under reflux conditions. Synthesis takes place through the reaction between the metal ions Na+, Mg2+, or Cu2+ as the central atom and curcumin as the ligand. Curcumin has been consumed after the reaction lasts for four hours, shown by thin-layer chromatography in which a new spot appears at higher Rf as the spot of curcumin disappears in the reaction mixture. Compared with the spectrum of curcumin, the FTIR spectra of the complexes show changes in the absorption bands and shifts of wave numbers particularly in absorption bands of phenolic –OH and C=O enol groups which strongly indicates the coordination of metal ions with the curcumin ligand which is proposed to be in β–1,3 diketone system. Also, the FTIR spectra of the reaction product showed typical absorption bands for the metal-oxygen group, M–O, at 524 cm–1, 670 cm–1 and 470 cm–1 in Na+–curcumin, Mg2+–curcumin and Cu2+–curcumin, respectively.

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Andruh, Marius. "Heterotrimetallic complexes in molecular magnetism." Chemical Communications 54, no. 29 (2018): 3559–77. http://dx.doi.org/10.1039/c8cc00939b.

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Rabanal-León, Walter A., Juliana A. Murillo-López, and Ramiro Arratia-Pérez. "Insights into bonding interactions and excitation energies of 3d–4f mixed lanthanide transition metal macrocyclic complexes." Physical Chemistry Chemical Physics 18, no. 48 (2016): 33218–25. http://dx.doi.org/10.1039/c6cp07001a.

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This work provides insights into the metal/macrocyclic (host–guest) interaction and spectroscopic properties of the macrocyclic coordination compounds containing both lanthanide and transition metals inside their framework.

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Gerile, Naren, Li Hong Bao, Jin Kang Zhang, Ying Zhang, Xiao Tian, Ta Na Bao, and Ojiyed Tegus. "Effect of Moisture Content on the Diverse Structure State of the Octanoyl Alanine Metal (Mg, Ca) Complexes." Solid State Phenomena 288 (March 2019): 1–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.288.1.

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Octanoyl alanine ligands and metal ions (Mg2+, Ca2+) form metal complexes of octanoyl alanine through chemical coordination bonds [1]. According to the acid base reaction and the Lewis acid-base theory[2], the molecule or ion of the central atom or ion (collectively called the central atom) and the ligand (called ligand) around it, completely or partially by the coordination bond to form metal complex. These octanoyl alanine complexes are soluble in water and easily ionize into internal coordination ions and external ions, while the ligands and central atoms do not ionize in the inner boundary. The octanoyl alanine magnesium and calcium complexes belongs to the amino acid metal complexes, which can be widely used in daily life, industrial production and life science in the future application. Recently, with the rapid development of amino acid metal complexes [3-7], it is not only associated with inorganic compounds and organometallic compounds, but also overlaps with the chemistry, coordination catalysis and molecular biology of the current chemical frontiers [8-10]. In this paper, [C10H20NCO3]2M type metal complexes prepared by combining octanoyl alanine ligand with metal ions containing functional group COOH, the influence of water content on the DSC curve and surface morphology of metal complexes was studied, and the information of the diversified structure state of the materials complex can be obtained.

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Mahmoudi, Ghodrat, Saikat Kumar Seth, Antonio Bauza Riera, Fedor Ivanovich Zubkov, and Antonio Frontera. "Novel Pb(II) Complexes: X-Ray Structures, Hirshfeld Surface Analysis and DFT Calculations." Crystals 10, no. 7 (July 2, 2020): 568. http://dx.doi.org/10.3390/cryst10070568.

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Herein we report the synthesis and detailed structural characterization of two new centrosymmetric dinuclear coordination compounds of Pb(II) [Pb2L2(NCS)4] (1) and [Pb2L2(NO3)4]∙2MeOH (2), using the organic ligand 1,2-diphenyl-1,2-bis((methyl(pyridin-2-yl)methylene)hydrazono)ethane (L). In both complexes, each subunit [PbLX2 (X = NO3 or NCS)] adopts a quasi-aromatic Möbius metal chelate structure. Each ligand L is coordinated in a tetradentate coordination mode to Pb(II), yielding the 12π electron chelate ring via two pyridyl-imine units. In compound (1), the coordination sphere is completed by one disordered N,S-coordinated thiocyanate anion and two μ1,1-bridging N-coordinated thiocyanate anions. In compound (2), the coordination sphere of Pb(II) is completed by two monodentate and two bidentate nitrato ligands (two of them acting as bridging ligands). Crystal packing of both compounds is stabilized by intermolecular hydrogen bonds, intra- and intermolecular C–H∙∙∙π interactions. The Hirshfeld molecular surfaces of (1) and (2) demonstrate that their packing is dominated by C–H∙∙∙O/N/S interactions as well as by far less favored H∙∙∙H contacts.

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Peigné, Benjamin, and Gabriel Aullón. "Structural analysis of the coordination of dinitrogen to transition metal complexes." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 71, no. 3 (May 29, 2015): 369–86. http://dx.doi.org/10.1107/s2052520615006083.

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Transition-metal complexes show a wide variety of coordination modes for the nitrogen molecule. A structural database study has been undertaken for dinitrogen complexes, and geometrical parameters around theLnM—N2unit are retrieved from the Cambridge Structural Database. These data were classified in families of compounds, according to metal properties, to determine the degree of lengthening for the dinitrogen bonding. The importance of the nature of the metal center, such as coordination number and electronic configuration, is reported. Our study reveals poor activation by coordination of dinitrogen in mononuclear complexes, always havingend-oncoordination. However, partial weakening of nitrogen–nitrogen bonding is found forend-onbinuclear complexes, whereasside-oncomplexes can be completely activated.

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Vojinovic-Jesic, Ljiljana, Sladjana Novakovic, Vukadin Leovac, and Valerija Cesljevic. "Transition metal complexes with Girard reagents and their hydrazones." Journal of the Serbian Chemical Society 77, no. 9 (2012): 1129–55. http://dx.doi.org/10.2298/jsc120704083v.

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This is the first review dealing with the coordination chemistry of metal complexes with Girard's reagents and their hydrazones. The short introduction points out to chemical properties and significance of these organic compounds. The next section briefly describes synthetic methods for preparing complexes with Girard's reagents, as well as modes of coordination of these ligands. The last two extensive sections review the preparation, stereochemistry and structural characteristics of metal complexes with Girard's hydrazones, including some newer non-hydrazonic derivatives of Girard's reagents, also.

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Savchenkov, Anton V., Anna V. Vologzhanina, Artem O. Dmitrienko, Yan V. Zubavichus, Denis V. Pushkin, Larisa B. Serezhkina, and Viktor N. Serezhkin. "Crystal structures of uranyl complexes with isobutyrate and isovalerate anions." Dalton Transactions 47, no. 6 (2018): 1849–56. http://dx.doi.org/10.1039/c7dt04042c.

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Types of sodium coordination, depolymerization of metal–oxygen frameworks and coordination sequences are analyzed for establishing correlations between composition and crystal structure in the family of analogous compounds.

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Berezhnytska, Оeksandra, Oleksandr Rohovtsov, Artur Horbenko, Yaroslav Fedorov, Olena Trunova, Olena Chyhyrynets, and Sergey Smola. "THE COORDINATION COMPOUNDS Gd (III) AND Dy(III) WITH SOME β-DIKETONES." Ukrainian Chemistry Journal 87, no. 6 (July 26, 2021): 97–120. http://dx.doi.org/10.33609/2708-129x.87.06.2021.97-120.

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New complexes of Dy (III) and Gd (III) with b-diketones containing unsaturated and aryl substituents were synthesized. Metal polymers based on synthesized complexes were obtained by the method of radical polymerization. The composition and structure of synthesized complexes and metal polymers are established. It is shown that during polymerization the coordination environment of the central ion remains unchanged. The spectral-luminescent characteristics of the synthesized compounds were studied. The presence of water molecules in the immediate coordination environment causes a low intensity of emission of monomeric dysprosium complexes. In the luminescence spectra of metal polymers, there are bands magnetic dipole transition (4F9 → 6H15/2) and electric dipole transition (4F9 → 6H13/2). The close energies of the triplet level of the ligand and the resonant level of the dysprosium ion cause low emission characteristics of the synthesized dysprosium complexes.

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Fiallo, Marina M. L., Hayet Tayeb-Bel Haj, and Arlette Garnier-Suillerot. "Degradation of Anthracycline Antitumor Compounds Catalysed by Metal Ions." Metal-Based Drugs 1, no. 2-3 (January 1, 1994): 183–93. http://dx.doi.org/10.1155/mbd.1994.183.

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The influence of some metal ions on the degradation of anthracyclines was examined. One of the degradation products is the 7,8-dehydro-9,10-desacetyldoxorubicinone, D* (¥), usually formed by hydrolysis at slightly basic pH. D* is a lipophilic compound with no cytostatic properties. Its formation could be responsible for the lack of antitumor activity of the parent compound. The coordination of metal ions to anthracycline derivatives is required to have degradation products. Cations such as Na+, K+, or Ca2+ do not induce the D* formation however metals which can form stable complexes with doxorubicin afford D*. Iron(III) and copper(II) form appreciable amount of D* at slightly acidic pH. Terbium(III) forms D* but its complex is stable only at slightly basic pH. Palladium(II) which does not form D*. The influence of the coordination mode of metal ions to anthracycline on the D* formation is discussed.

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Ávila-Torres, Yenny, Lázaro Huerta, and Noráh Barba-Behrens. "XPS-Characterization of Heterometallic Coordination Compounds with Optically Active Ligands." Journal of Chemistry 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/370637.

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The heterometallic optical complexes [Cu2Co(S,S(+)cpse)3(H2O)3]·4H2O (1) and [Cu2Ni(S,S(+)cpse)3(H2O)3]·10H2O (2) were obtained from the mononuclear copper(II) compound by the addition of nickel(II) or cobalt(II) chlorides, where (H2cpse) is the acetyl amino alcohol derivative N-[2-hydroxy-1(R)-methyl-2(R)-phenylethyl]-N-methylglycine. In comparison with the homotrinuclear copper(II) compound [Cu3(S,S(+)cpse)3(H2O)3]·8H2O reported previously, the substitution of a copper(II) atom by one cobalt(II) ion gave place to a heterotrinuclear compound1, which presents ferromagnetic-antiferromagnetic behaviour. When substituting a copper(II) by a nickel(II) ion, the trinuclear compound2showed an antiferromagnetic coupling. The magnetic behaviour of the heterotrinuclear compounds is driven by the nature of the metal ion which was introduced in the copper(II) triangular array. The ligand and its coordination compounds were characterized by IR, UV-Vis-NIR. Their chemical was confirmed by photoelectron spectroscopy (XPS).

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Davies, Alwyn G., and Paul F. McMillan. "Robin Jon Hawes Clark. 16 February 1935—6 December 2018." Biographical Memoirs of Fellows of the Royal Society 68 (January 8, 2020): 103–29. http://dx.doi.org/10.1098/rsbm.2019.0037.

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Robin Clark was a distinguished physical/inorganic chemist who made major discoveries in the coordination chemistry of the early transition metals, especially of titanium and vanadium complexes with high coordination numbers (notably seven and eight) and of the structures and physical properties of mixed valence, linear chain and metal–metal bonded compounds. He applied far-infrared spectroscopy to study metal–ligand vibrations systematically and established the technique for structure elucidation of transition metal and main group compounds. He also developed Raman and resonance Raman spectroscopy applied to inorganic compounds and highly coloured solids including mineral samples. That work led to his seminal applications of microbeam Raman spectroscopy for the identification of pigments and other constituents of artworks and historical artefacts, thereby developing a basis for testing their provenance and the identification of forgeries.

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Motswainyana, William M., and Peter A. Ajibade. "Anticancer Activities of Mononuclear Ruthenium(II) Coordination Complexes." Advances in Chemistry 2015 (February 19, 2015): 1–21. http://dx.doi.org/10.1155/2015/859730.

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Ruthenium compounds are highly regarded as potential drug candidates. The compounds offer the potential of reduced toxicity and can be tolerated in vivo. The various oxidation states, different mechanism of action, and the ligand substitution kinetics of ruthenium compounds give them advantages over platinum-based complexes, thereby making them suitable for use in biological applications. Several studies have focused attention on the interaction between active ruthenium complexes and their possible biological targets. In this paper, we review several ruthenium compounds which reportedly possess promising cytotoxic profiles: from the discovery of highly active compounds imidazolium [trans-tetrachloro(dmso)(imidazole)ruthenate(III)] (NAMI-A), indazolium [trans-tetrachlorobis(1H-indazole)ruthenate(III)](KP1019), and sodium trans-[tetrachloridobis(1H-indazole)ruthenate(III)] (NKP-1339) to the recent work based on both inorganic and organometallic ruthenium(II) compounds. Half-sandwich organometallic ruthenium complexes offer the opportunity of derivatization at the arene moiety, while the three remaining coordination sites on the metal centre can be functionalised with various coordination groups of various monoligands. It is clear from the review that these mononuclear ruthenium(II) compounds represent a strongly emerging field of research that will soon culminate into several ruthenium based antitumor agents.

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Kang, Linda, Genevieve Lynch, Will Lynch, and Clifford Padgett. "Manganese(II) chloride complexes with pyridineN-oxide (PNO) derivatives and their solid-state structures." Acta Crystallographica Section E Crystallographic Communications 73, no. 10 (September 12, 2017): 1434–38. http://dx.doi.org/10.1107/s2056989017012038.

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Three manganese(II)N-oxide complexes have been synthesized from the reaction of manganese(II) chloride with either pyridineN-oxide (PNO), 2-methylpyridineN-oxide (2MePNO) or 3-methylpyridineN-oxide (3MePNO). The compounds were synthesized from methanolic solutions of MnCl2·4H2O and the respectiveN-oxide, and subsequently characterized structurally by single-crystal X-ray diffraction. The compounds arecatena-poly[[aquachloridomanganese(II)]-di-μ-chlorido-[aquachloridomanganese(II)]-bis(μ-pyridineN-oxide)], [MnCl2(C5H5NO)(H2O)]nor [MnCl2(PNO)(H2O)]n(I),catena-poly[[aquachloridomanganese(II)]-di-μ-chlorido-[aquachloridomanganese(II)]-bis(μ-2-methylpyridineN-oxide)], [MnCl2(C6H7NO)(H2O)]nor [MnCl2(2MePNO)(H2O)]n(II), and bis(μ-3-methylpyridineN-oxide)bis[diaquadichloridomanganese(II)], [Mn2Cl4(C6H7NO)2(H2O)4] or [MnCl2(3MePNO)(H2O)2]2(III). The MnIIatoms are found in pseudo-octahedral environments for each of the three complexes. CompoundIforms a coordination polymer with alternating pairs of bridgingN-oxide and chloride ligands. The coordination environment is defined by two PNO bridging O atoms, two chloride bridging atoms, a terminal chloride, and a terminal water. CompoundIIalso forms a coordination polymer with a similar metal cation; however, the coordination polymer is bridged between MnIIatoms by both a single chloride and 2MePNO. The distorted octahedrally coordinated metal cation is defined by two bridging 2MePNOtransto each other, two chlorides, alsotransto one another in the equatorial (polymeric) plane, and a terminal chloride and terminal water. Finally, complexIIIforms a dimer with two bridging 3MePNOs, two terminal chlorides and two terminal waters forming the six-coordinate metal environment. All three compounds exhibit hydrogen bonding between the coordinating water(s) and terminal chlorides.

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Bruce, MI, and AH White. "Some Chemistry of Pentakis(methoxycarbonyl)cyclopentadiene, HC5(CO2Me)5, and Related Molecules." Australian Journal of Chemistry 43, no. 6 (1990): 949. http://dx.doi.org/10.1071/ch9900949.

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This article summarizes the results of investigations into the chemistry of HC5(CO2Me)5 and, in particular, of metal complexes containing the C5(CO2Me)5 ligand . As an anion, the ligand is very stable, forming air-stable, water-soluble salts with many cations with coordination to the metal atom in the solid state generally occurring through the ester carbonyl groups. Second- and third-row transition metals form complexes which retain the covalent ligand-metal bond in solution, 'harder' metals coordinating by the ester carbonyl groups, while 'softer' metals are bound to the ring carbons; a variety of behaviour is shown by the Group 11 metals. Even when the ligand is η5-bonded to the metal, ready displacement by other ligands may occur, as found with Ru (η-C5H5){η5-C5(CO2Me)5}, for example. In the rhodium system, formal replacement of CO2Me groups by hydrogen is found, as with the formation of [ Rh {η5-C5H2(CO2Me)3}2][C5(CO2Me)5]. Brief mention is made of other polysubstituted cyclopentadienyls with electron-withdrawing ligands and some related compounds, and their metal derivatives where known.

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Grau, Jordi, Cristina Renau, Ana B. Caballero, Amparo Caubet, Marta Pockaj, Julia Lorenzo, and Patrick Gamez. "Evaluation of the metal-dependent cytotoxic behaviour of coordination compounds." Dalton Transactions 47, no. 14 (2018): 4902–8. http://dx.doi.org/10.1039/c7dt04604a.

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The [Cu(L)Cl2]2 and [Pt(L)Cl2] complexes were prepared from the simple Schiff-base ligand (E)-phenyl-N-((pyridin-2-yl)methylene)methanamine (L) and respectively, CuCl₂ and cis-[PtCl₂(DMSO)₂].

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Jiao, Ti Feng, Jian Liu, Li Hua Gao, Jing Xin Zhou, and Yuan Yuan Xing. "Research on Some Aromatic Schiff Base Compounds and Metal Complexes with Different Substituted Groups." Key Engineering Materials 474-476 (April 2011): 1523–28. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1523.

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Two aromatic Schiff base derivatives and the corresponding metal complexes with different substituted groups were synthesized and characterized by many methods. The products were characterized by UV-Vis spectra, FT-IR spectra and thermal analysis, while the thermal stability was measured by TG-DTA instrument. FT-IR analysis indicated that the nitrogen atom in imino group and oxygen atom in phenolic hydroxyl group participated in coordinating with transition metal ion in different bridged mode. UV spectra also verified that different coordination modes can be performed between metal ions and ligands. In addition, the thermal stability of metal complexes had been obviously superior to that of the ligands. All results give a useful clue to obtain Schiff base derivatives with versatile property by regulating intramolecular substituted group and species of metal ion. The present results have showed potential application in fields of functional material and catalyst.

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Pobłocki, Kacper, Joanna Drzeżdżon, Tomasz Kostrzewa, and Dagmara Jacewicz. "Coordination Complexes as a New Generation Photosensitizer for Photodynamic Anticancer Therapy." International Journal of Molecular Sciences 22, no. 15 (July 28, 2021): 8052. http://dx.doi.org/10.3390/ijms22158052.

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Photodynamic therapy (PDT) has become an alternative to standard cancer treatment methods such as surgery, chemotherapy and radiotherapy. The uniqueness of this method relies on the possibility of using various photosensitizers (PS) that absorb and convert light emission in radical oxygen-derived species (ROS). They can be present alone or in the presence of other compounds such as metal organic frameworks (MOFs), non-tubules or polymers. The interaction between DNA and metal-based complexes plays a key role in the development of new anti-cancer drugs. The use of coordination compounds in PDT has a significant impact on the amount ROS generated, quantum emission efficiency (Φem) and phototoxic index (PI). In this review, we will attempt to systematically review the recent literature and analyze the coordination complexes used as PS in PDT. Finally, we compared the anticancer activities of individual coordination complexes and discuss future perspectives. So far, only a few articles link so many transition metal ion coordination complexes of varying degrees of oxidation, which is why this review is needed by the scientific community to further expand this field worldwide. Additionally, it serves as a convenient collection of important, up-to-date information.

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Sinha, Indranil, Lukas Heller, Jutta Kösters, and Jens Müller. "7-Methyl-6-furylpurine forms dinuclear metal complexes with N3,N9 coordination." Zeitschrift für Naturforschung B 73, no. 11 (November 27, 2018): 813–17. http://dx.doi.org/10.1515/znb-2018-0110.

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AbstractTwo dinuclear metal complexes bearing the purine derivative 7-methyl-6-furylpurine (1b) as a ligand are reported. In [Ag2(1b)2(DMSO)2](ClO4)2·DMSO and [Cu2(1b)2(NO3)2], two bridging purine derivatives coordinate the two metal ions via their N3 and N9 positions. In the silver(I) complex, the coordination environment of each metal ion is completed by a DMSO ligand, whereas an additional nitrato ligand coordinates to each copper(I) ion. The intramolecular Ag···Ag distance of 3.1069(5) Å is in agreement with the presence of a weak argentophilic interaction, whereas the Cu···Cu distance of 2.9382(4) Å is too long to be indicative of a cuprophilic interaction. The compounds represent the first examples of dinuclear complexes comprising two N3,N9-bridging purine derivatives without any additional bridging ligand.

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Topală, Tamara, Andreea Bodoki, Luminiţa Oprean, and Radu Oprean. "Bovine serum albumin interactions with metal complexes." Medicine and Pharmacy Reports 87, no. 4 (November 12, 2014): 215–19. http://dx.doi.org/10.15386/cjmed-357.

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The continuous search for new molecules with therapeutic abilities has led to the synthesis and characterization of a large number of metal complexes, proven to exhibit potential as pharmacological agents through their antibacterial, antiviral, antifungal and antineoplastic properties. As serum albumins play a key role in drug pharmacokinetics and pharmacodynamics, the study of coordination compounds affinity towards this class of proteins, as well as understanding the mechanism through which they interact is crucial. The aim of this review is to focus on the structure and biological functions of bovine serum albumin, the design of metal complexes that are able to bind to the biomolecule, as well as the experimental techniques employed in the study and evaluation of these interactions. Keywords: drug-protein interaction, coordination complex, fluorescence spectroscopy, UV-Vis absorption spectroscopy.

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Caputo, Christine A., Florentino d. S. Carneiro, Michael C. Jennings, and Nathan D. Jones. "Modular syntheses of oxazolinylamine ligands and characterization of group 10 metal complexes." Canadian Journal of Chemistry 85, no. 2 (February 1, 2007): 85–95. http://dx.doi.org/10.1139/v06-188.

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The syntheses of aminoalkyloxazoline and pyrrolidinyloxazoline ligands, each of which bear a pair of chiral centres, by both known and new routes are reported. Variable temperature NMR studies show that the known stepwise syntheses of the pyrrolidinyl compounds are not complicated by epimerization; however, coordination of one of the aminoalkyl derivatives to Pt(II) under conditions of prolonged heating to 80 °C does give mixtures of diastereomeric N,N ′-chelated complexes that result from inversion of the chiral centre associated with the aminoalkyl fragment. A new synthesis of pyrrolidinyloxazoline ligands that involves the Zn-catalyzed cyclization of Cbz-protected 2-cyanopyrrolidine and β-amino alcohols is also reported. This procedure offers the advantages of economy, shorter time, and fewer purification steps over the previously reported synthesis. In addition, the crystal structure of an enantiopure Pd(II) complex of an N,N ′-chelated pyrrolidinyloxazoline is disclosed. This compound has a pseudo-C2 axis of symmetry, which may make it suitable for asymmetric catalytic applications.Key words: chiral ligands, ligand design, oxazolines, variable temperature NMR spectroscopy, asymmetric catalysis, coordination compounds, palladium, platinum

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Liu, Guo-Cheng, Nai-Li Chen, Ju-Wen Zhang, Yun Qu, Hong-Yan Lin, and Xin-Jie Gao. "Effects of Metal Ions and N-Donor Ligands with Different Coordination Characters on the Construction of d10 Metal-organic Complexes with Selective Photocatalytic Activities." Zeitschrift für Naturforschung B 69, no. 6 (June 1, 2014): 681–90. http://dx.doi.org/10.5560/znb.2014-3326.

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Four new d10 metal-organic coordination polymers, [Zn(L)(phen)(H2O)] (1), [Cd(L)(phen)] (2), [Zn(L)(bppdc)]·3H2O (3), and [Cd(L)(bppdc)]·3H2O (4) [L=2-carboxymethylsulfanyl nicotinic acid, phen=1,10-phenanthroline, bppdc=N;N`-bis(pyridin-3-yl)pyridine-2,6-dicarboxamide], have been obtained from hydrothermal reactions of zinc(II)=cadmium(II) nitrates with the semi-rigid N-= S-containing dicarboxylate L, and the two structurally disparate neutral N-donor ligands phen and bppdc. Single-crystal X-ray diffraction analysis has revealed that compound 1 is a one-dimensional (1- D) helical coordination polymer linked by ZnII atoms and L spacers. Compound 2 features a doublechain structure connected via binuclear CdII units and pairs of L linkers. Adjacent chains of 1 and 2 are packed into 3-D supramolecular networks by hydrogen bonds and p-p stacking interactions. Compounds 3 and 4 exhibit similar 2-D (4,4)-connected wave-like networks based on linear [M-L]n and zigzag [M-bppdc]n metal-organic chains (M=ZnII for 3 and CdII for 4). The effects of metal ions and N-donor ligands with different coordination characters are discussed. Moreover, the photoluminescence properties and photocatalytic activities of compounds 1 - 4 were investigated.

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32

Kovalchukova, Olga V., Al Tahan Rana Abdulilla Abbas, Svetlana B. Strashnova, and Pavel V. Strashnov. "Tautomeric transformations and electronic structures of azopyrazolone dyes and their metal complexes." Reviews in Inorganic Chemistry 38, no. 3 (August 28, 2018): 87–101. http://dx.doi.org/10.1515/revic-2018-0007.

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AbstractThe features of molecular and electronic structures of complex compounds derived from azopyrazolone derivatives are reviewed. Despite the wide use of metal-containing azopyrazolone dyes for more than 1.5 centuries, little information on their molecular structure is found. Our recent researches allowed the introduction of new coordination modes of azopyrazolone derivatives at complexation with metals. Together with traditional bi- and tridentate coordination, the possibility of an N pyrazolone atom to be involved in coordination was also found. As a result, polymeric or polynuclear complexes were isolated and described by X-ray analysis, NMR, EPR, IR, and UV spectroscopy. The analysis of the interatomic distances in the organic anions indicated that azopyrazolone derivatives do not undergo significant azo-hydrazo tautomeric transformations at ionization and complexation despite strong shifts of the absorption bands in their IR and UV-VIS spectra.

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Singh, Baljit, and Shavina Shavina. "Direct Electrochemical Synthesis of Nickel (II) Thiolates and their Coordination Complexes." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 9 (July 29, 2015): 3973–78. http://dx.doi.org/10.24297/jac.v11i9.2688.

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Metallo organic compounds can be synthesized electrochemically by anodic generation of metal cations by using sacrificial metal anode. Bis-thiolates complexes of Nickel, Ni(SR)2 have been prepared in an H-type cell by electrochemical oxidation of thiols RSH (ethanethiol, 2-propanethiol, 1-butanethiol, 1-pentanethiol and thiophenol) with sacrificial Nickel (Ni) anode and inert Platinum (Pt) cathode in non-aqueous solution of acetonitrile containing tetrabutylammonium chloride (as supporting electrolyte). On refluxing with ligand (L) 2,2'-bipyridyl, these thiolates do not form coordination compounds. However, their adducts Ni(SR)2.L have been synthesized electrochemically by adding the ligand to above thiols in solution phase. All these synthesized complexes have been characterized by elemental analysis, infrared spectral data and other physical measurements. All these compounds are in the solid state with excellent yield and associated with high electrochemical efficiency.

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34

Sumby, Christopher J., Ben A. Leita, Boujemaa Moubaraki, Keith S. Murray, and Peter J. Steel. "Synthesis and Coordination Chemistry of Doubly-Tridentate Tripodal Pyridazine and Pyrimidine-Derived Ligands: Structural Interplay Between M2L and M2L2 (M = Ni and Pd) Complexes and Magnetic Properties of Iron(II) Complexes." Australian Journal of Chemistry 62, no. 9 (2009): 1142. http://dx.doi.org/10.1071/ch09244.

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The coordination chemistry of three bridging doubly-tridentate ligands, including the known compound 3,6-bis(di-2-pyridylmethyl)pyridazine (1), which is structurally similar to 1,4-bis(di-2-pyridylmethyl)phthalazine (2), and two pyrimidine-linked compounds 4,6-bis(di-2-pyridylmethyl)pyrimidine (3), and 4,6-bis(di-2-pyridylamino)pyrimidine (4), was investigated with FeII, NiII, and PdII metal salts. Ligands 3 and 4 were synthesized in one-pot reactions from easily obtained starting materials; compound 3 was synthesized from di-2-pyridylmethane and 4,6-diiodopyrimidine in 48% yield, while ligand 4 was prepared by reacting di-2-pyridylamine with 4,6-dichloropyrimidine in 27% yield. During the synthesis of 4, an additional compound, 4-chloro-6-(di-2-pyridylamino)pyrimidine (5), with only one tridentate binding site was obtained in 30% yield. Reactions of 1, 3, and 4 with FeII or NiII salts gave two types of complexes, either discrete M2L or M2L2 assemblies. The PdII complexes obtained were also characterized as discrete M2L complexes. The compounds were characterized by a combination of NMR and IR spectroscopy, microanalysis and X-ray crystallography. Noticeable differences in the structures obtained for NiII coordination complexes with the carbon-linked (3) and nitrogen-linked (4) ligands were observed, whereby the nitrogen linker adopted a trigonal planar geometry and prevented tridentate facial coordination of the octahedral metal centres. The magnetic properties of dinuclear FeII complexes of 1 were examined to see if they showed spin-crossover effects, a feature recently observed by others in other dinuclear helicate complexes, but the complexes remained high-spin at all temperatures between 300 and 2 K.

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Unruh, Daniel, Patrick Homenya, Manish Kumar, Ralf Sindelar, Yann Garcia, and Franz Renz. "Spin state switching of metal complexes by visible light or hard X-rays." Dalton Transactions 45, no. 36 (2016): 14008–18. http://dx.doi.org/10.1039/c6dt01745b.

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Different kinds of stimuli to induce spin crossover in iron compounds are covered, focusing on electromagnetic irradiation-induced spin state switching phenomena in mono- as well as multinuclear coordination compounds.

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36

Bartalucci, Niccolò, Marco Bortoluzzi, Guido Pampaloni, Calogero Pinzino, Stefano Zacchini, and Fabio Marchetti. "Stable coordination complexes of α-diimines with Nb(v) and Ta(v) halides." Dalton Transactions 47, no. 10 (2018): 3346–55. http://dx.doi.org/10.1039/c8dt00122g.

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Uncommon coordination compounds of high valent transition metal halides with N-aryl α-diimines have been obtained, without the need for reducing agents to quench the activation power of the metal centre.

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37

Zeisel, Lukas, Norbert Szimhardt, Maximilian H. H. Wurzenberger, Thomas M. Klapötke, and Jörg Stierstorfer. "2-Methyl-substituted monotetrazoles in copper(ii) perchlorate complexes: manipulating coordination chemistry and derived energetic properties." New Journal of Chemistry 43, no. 2 (2019): 609–16. http://dx.doi.org/10.1039/c8nj05375h.

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Several new energetic coordination compounds (ECC) have been prepared using two 2-methyl-substituted tetrazoles. By simply changing the reaction conditions, the coordination sphere of the metal center can be manipulated in order to obtain different complexes with varying energetic properties.

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38

Ehrlich, Lisa, Robert Gericke, Erica Brendler, and Jörg Wagler. "(2-Pyridyloxy)silanes as Ligands in Transition Metal Coordination Chemistry." Inorganics 6, no. 4 (October 31, 2018): 119. http://dx.doi.org/10.3390/inorganics6040119.

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Proceeding our initial studies of compounds with formally dative TM→Si bonds (TM = Ni, Pd, Pt), which feature a paddlewheel arrangement of four (N,S) or (N,N) bridging ligands around the TM–Si axis, the current study shows that the (N,O)-bidentate ligand 2-pyridyloxy (pyO) is also capable of bridging systems with TM→Si bonds (shown for TM = Pd, Cu). Reactions of MeSi(pyO)3 with [PdCl2(NCMe)2] and CuCl afforded the compounds MeSi(µ-pyO)4PdCl (1) and MeSi(µ-pyO)3CuCl (2), respectively. In the latter case, some crystals of the Cu(II) compound MeSi(µ-pyO)4CuCl (3) were obtained as a byproduct. Analogous reactions of Si(pyO)4, in the presence of HpyO, with [PdCl2(NCMe)2] and CuCl2, afforded the compounds [(HpyO)Si(µ-pyO)4PdCl]Cl (4), (HpyO)2Si[(µ-pyO)2PdCl2]2 (5), and (HpyO)2Si[(µ-pyO)2CuCl2]2 (6), respectively. Compounds 1–6 and the starting silanes MeSi(pyO)3 and Si(pyO)4 were characterized by single-crystal X-ray diffraction analyses and, with exception of the paramagnetic compounds 3 and 6, with NMR spectroscopy. Compound 2 features a pentacoordinate Si atom, the Si atoms of the other complexes are hexacoordinate. Whereas compounds 1–4 feature a TM→Si bond each, the Si atoms of compounds 5 and 6 are situated in an O6 coordination sphere, while the TMCl2 groups are coordinated to pyridine moieties in the periphery of the molecule. The TM–Si interatomic distances in compounds 1–4 are close to the sum of the covalent radii (1 and 4) or at least significantly shorter than the sum of the van-der-Waals radii (2 and 3). The latter indicates a noticeably weaker interaction for TM = Cu. For the series 1, 2, and 3, all of which feature the Me–Si motif trans-disposed to the TM→Si bond, the dependence of the TM→Si interaction on the nature of TM (Pd(II), Cu(I), and Cu(II)) was analyzed using quantum chemical calculations, that is, the natural localized molecular orbitals (NLMO) analyses, the non-covalent interaction (NCI) descriptor, Wiberg bond order (WBO), and topological characteristics of the bond critical points using the atoms in molecules (AIM) approach.

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39

Aiyelabola, T. O., E. O. Akinkunmi, and O. Osungunna. "Syntheses, Characterization and Biological Activity of Coordination Compounds of Propanedioic Acid and its Mixed Ligand Complexes with N,N'-Dihydroxy-2,3-butanediimine." Asian Journal of Chemistry 33, no. 8 (2021): 1911–18. http://dx.doi.org/10.14233/ajchem.2021.23309.

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The coordination compounds of propanedioic acid with cobalt(II), nickel(II) and copper(II) ions were synthesized using metal:ligand 1:2. In addition to this, mixed ligand complexes using the same metal ions with propanedioic acid as the primary ligand and N,N'-dihydroxy-2,3-butanediimine as the secondary ligand were also synthesized using M:L1:L2 (1:1:1) where L1 = propanedioic acid, L2 = N,N'-dihydroxy-2,3-butanediimine and M = Cu(II), Ni(II) and Cu(II). The synthesized compounds were characterized using FTIR, UV-vis, magnetic susceptibility measurement and percentage metal composition. The ligand and its metal complexes were tested for their cytotoxic and antibacterial activities. Results indicated that a dimeric square planar geometry was assumed by the cobalt(II) and nickel(II) propanedioic acid complexes. Octahedral geometry was proposed for both cobalt(II) and copper(II) mixed ligand complexes. A dinuclear square pyramidal geometry was suggested for the copper(II) propanedioic acid complex and square planar/octahedral geometry for the nickel(II) mixed ligand complex. The copper(II) propanedioic acid complex elicited the best cytotoxic activity. On the other hand, the nickel(II) propanedioic acid complex showed the remarkable antimicrobial activity. The compounds exhibited good antimicrobial activity in most of the cases with the exception of the cobalt(II) propanedioic acid complex. It was concluded that coordination of the ligands to the metal ions lowered the toxicity of the ligands. It was further concluded that the antimicrobial activity of the compounds was partly dependent on the synergism/additive effect of the intrinsic therapeutic properties of the metal ion and the ligands within the coordination sphere of the complexes synthesized. And this is also in part a function of the geometry assumed by the complexes.

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40

Braun, Vanessa, Maximilian H. H. Wurzenberger, Valentin Weippert, and Jörg Stierstorfer. "Tailoring the properties of 3d transition metal complexes with different N-cycloalkyl-substituted tetrazoles." New Journal of Chemistry 45, no. 25 (2021): 11042–50. http://dx.doi.org/10.1039/d1nj01675j.

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41

Bonaccorso, Carmela, Tiziano Marzo, and Diego La Mendola. "Biological Applications of Thiocarbohydrazones and Their Metal Complexes: A Perspective Review." Pharmaceuticals 13, no. 1 (December 25, 2019): 4. http://dx.doi.org/10.3390/ph13010004.

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Although organic compounds account for more than 99% of currently approved clinical drugs, the established clinical use of cisplatin in cancer or auranofin in rheumatoid arthritis have paved the way to several research initiatives to identify metal-based drugs for a wide range of human diseases. Nitrogen and sulfur donor ligands, characterized by different binding motifs, have been the subject in recent years of one of the main research areas in coordination chemistry. Among the nitrogen/sulfur compounds, very little is known about thiocarbohydrazones (TCH), the higher homologues of the well-known thiosemicarbazones (TSC), and their metal complexes. The extra hydrazine moiety provides the ligands of variable metal binding modes, structural diversity and promising biological implications. The interesting coordination chemistry of TCH has mainly been focused on symmetric derivatives, which are relatively simple to synthesize while few examples of asymmetric ligands have been reported. This informative review on TCHs and their metal complexes will be helpful for improving the design of metal-based pharmaceuticals for applications ranging from anticancer to antinfective therapy.

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42

King-Díaz, Beatriz, Josefina Montes-Ayala, Concepción Escartín-Guzmán, Silvia E. Castillo-Blum, Roberto Iglesias-Prieto, Blas Lotina-Hennsen, and Norah Barba-Behrens. "Cobalt(II) Coordination Compounds of Ethyl 4-Methyl-5-Imidazolecarboxylate: Chemical and Biochemical Characterization on Photosynthesis and Seed Germination." Bioinorganic Chemistry and Applications 3, no. 1-2 (2005): 93–108. http://dx.doi.org/10.1155/bca.2005.93.

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In this work we present the synthesis, structural and spectroscopic characterization of Co2+coordination compounds with ethyl 4-methyl-5-imidazolecarboxylate (emizco). The effects of emizco, the metal saltsCoCl2.6H2O,CoBr2,Co(NO3)2.6H2Oand their metal coordination compounds[Co(emizco)2Cl2],[Co(emizco)2Br2].H2O,[Co(emizco)2(H2O)2](NO3)2.2H2Owere evaluated on photosynthesis in spinach chloroplasts. Seed germination and seedling growth of the monocotyledonous speciesLolium multiflorumandTriticum aestivumand the dicotyledonous speciesTrifolium alexandrinumandPhysalis ixocarpawere also assayed under the effect of the compounds and salts. The results showed that cobalt(II) salts and their emizco coordination compounds inhibit photosynthetic electron flow and ATP-synthesis, behaving as Hill reaction inhibitors. Coordination compounds are more potent inhibitors than the salts. It was found that the salts target is at the b6f level while the complexes targets are at QB(D1)-protein and b6f level. The QBinhibition site was confirmed by variable chlorophyllafluorescence yield. On the other hand, emizco inhibits seed germination, root and shoot development, in both weed and crop species. Cobalt(II) coordination compounds are the most effective photosynthesis inhibitors, but they are less potent than emizco in germination and seedling growth, while the metal salts are the least active of all.

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43

Pozas-Tormo, Rafaela, Sebastián Bruque Gamez, María Martinez-Lara, and Laureano Moreno-Real. "Interlayer ammine complexes of metal uranyl phosphates." Canadian Journal of Chemistry 66, no. 11 (November 1, 1988): 2849–54. http://dx.doi.org/10.1139/v88-441.

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The solids derived from HUP by substituting metallic ions for protons, take up Lewis base molecules (like NH3 and C4H9NH2) in the interlamellar space. The diffractograms of these inclusion compounds indicate that the host crystallinity was preserved.The infrared spectroscopy of the Ni, Co, Cu, Zn, and Cd intercalates revealed that part of the sorbate was protonated in the interlaminar space while the other part displaced the water in their coordination spheres. However, in the Mn derivative, no coordinated or free Lewis base could be detected: it was all in the protonated form.

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44

Petrenko, I., D. Khomenko, R. Doroschuk, and R. Lampeka. "THE SYNTHESIS OF COPPER(II)-CONTAINING 1,2,4-TRIAZOLE COMPLEXES." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 2(54) (2017): 35–36. http://dx.doi.org/10.17721/1728-2209.2017.2(54).4.

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Methods of the synthesis of the copper(II) containing 3-(2-pyridinyl)-1H-1,2,4-triazole complexes are reported. Systematic studies were devoted to the investigating an importance of triethylamine towards the сomplexation. The various coordination modes that have been observed in complexes were discussed. We noticed the correlations of coordination complexes structure and the metal-ligand correlation. Two mononuclear complexes and one dinuclear complex of a 2:2 composition were obtained. The deprotonation of the ligand in the complex namely [Cu(L)2](H2O)2 was eased by adding triethylamine. The octahedral complex [Cu(HL)2(NO3)](NO3) was synthesized without triethylamine. In excess of ligands, mononuclear coordination compounds formed mostly. By adding the equal to ligand amount of triethylamine we obtained complex in a lower tetragonal symmetry. Deprotonated triazole is the high field ligand, therefore, due to the Jahn–Teller effect, square coordination is more desirable. In all coordination compounds formation of the 5-membered chelate cycle realizes through a pyridine-triazole binding site.The structures of three complexes have been determined by single crystal X-ray diffraction.

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Sumrra, Sajjad Hussain, Muhammad Ibrahim, Sabahat Ambreen, Muhammad Imran, Muhammad Danish, and Fouzia Sultana Rehmani. "Synthesis, Spectral Characterization, and Biological Evaluation of Transition Metal Complexes of Bidentate N, O Donor Schiff Bases." Bioinorganic Chemistry and Applications 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/812924.

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New series of three bidentate N, O donor type Schiff bases(L1)–(L3)were prepared by using ethylene-1,2-diamine with 5-methyl furfural, 2-anisaldehyde, and 2-hydroxybenzaldehyde in an equimolar ratio. These ligands were further complexed with Co(II), Cu(II), Ni(II), and Zn(II) metals to produce their new metal complexes having an octahedral geometry. These compounds were characterized on the basis of their physical, spectral, and analytical data. Elemental analysis and spectral data of the uncomplexed ligands and their metal(II) complexes were found to be in good agreement with their structures, indicating high purity of all the compounds. All ligands and their metal complexes were screened for antimicrobial activity. The results of antimicrobial activity indicated that metal complexes have significantly higher activity than corresponding ligands. This higher activity might be due to chelation process which reduces the polarity of metal ion by coordinating with ligands.

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46

Kawaguchi, Shinichi. "Variety in the coordination modes of β-dicarbonyl compounds in metal complexes." Coordination Chemistry Reviews 70 (July 1986): 51–84. http://dx.doi.org/10.1016/0010-8545(86)80035-2.

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47

Block, Eric, Evgeny V. Dikarev, Jin Jin, Bo Li, Marina A. Petrukhina, and Shao-Zhong Zhang. "Synthesis, structure, and chemistry of selenium-containing four-membered rings." Pure and Applied Chemistry 77, no. 12 (January 1, 2005): 2029–32. http://dx.doi.org/10.1351/pac200577122029.

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Recent chemistry of four-membered ring selenium compounds is reviewed followed by a summary of work in our laboratories in this area. 2-Thia-6-selenaspiro[3.3]heptane has been synthesized for the first time. X-ray structures for the latter compound as well as for 2,6-dithiaspiro[3.3]heptane and 2,6-diselenaspiro[3.3]heptane have been determined. These compounds are useful as "rigid-rod" ligands for coordination to transition-metal complexes.

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48

Soma sekhar, A., A. Jayaraju, and J. Sreeramulu. "Spectrochemical Investigation of di methoxy Aniline Dithiocarbamate metal complexes-Biological activity." Journal of Drug Delivery and Therapeutics 9, no. 6-s (December 15, 2019): 88–92. http://dx.doi.org/10.22270/jddt.v9i6-s.3741.

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Dithiocarbomates are a class of sulfur-based metal-chelating compounds commonly used in industry, agriculture, and medicine. 2,6 di methoxy Aniline dithiocarbamate Complexes of Copper and Ruthenium have been prepared and Characterized by Spectroscopic methods like IR,NMR and also analysis of Biological activity. The investigation of these complexes confirmed that the stability of metal–ligands coordination through, S & S,N atoms as bidendate chelates..

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Garau, Alessandra, Giacomo Picci, Massimiliano Arca, Alexander J. Blake, Claudia Caltagirone, Greta De Filippo, Francesco Demartin, et al. "Can Serendipity Still Hold Any Surprises in the Coordination Chemistry of Mixed-Donor Macrocyclic ligands? The Case Study of Pyridine-Containing 12-Membered Macrocycles and Platinum Group Metal ions PdII, PtII, and RhIII." Molecules 26, no. 5 (February 27, 2021): 1286. http://dx.doi.org/10.3390/molecules26051286.

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This study investigates the coordination chemistry of the tetradentate pyridine-containing 12-membered macrocycles L1-L3 towards Platinum Group metal ions PdII, PtII, and RhIII. The reactions between the chloride salts of these metal ions and the three ligands in MeCN/H2O or MeOH/H2O (1:1 v/v) are shown, and the isolated solid compounds are characterized, where possible, by mass spectroscopy and 1H- and 13C-NMR spectroscopic measurements. Structural characterization of the 1:1 metal-to-ligand complexes [Pd(L1)Cl]2[Pd2Cl6], [Pt(L1)Cl](BF4), [Rh(L1)Cl2](PF6), and [Rh(L3)Cl2](BF4)·MeCN shows the coordinated macrocyclic ligands adopting a folded conformation, and occupying four coordination sites of a distorted square-based pyramidal and octahedral coordination environment for the PdII/PtII, and RhIII complexes, respectively. The remaining coordination site(s) are occupied by chlorido ligands. The reaction of L3 with PtCl2 in MeCN/H2O gave by serendipity the complex [Pt(L3)(μ-1,3-MeCONH)PtCl(MeCN)](BF4)2·H2O, in which two metal centers are bridged by an amidate ligand at a Pt1-Pt2 distance of 2.5798(3) Å and feature one square-planar and one octahedral coordination environment. Density Functional Theory (DFT) calculations, which utilize the broken symmetry approach (DFT-BS), indicate a singlet d8-d8 PtII-PtII ground-state nature for this compound, rather than the alleged d9-d7 PtI-PtIII mixed-valence character reported for related dinuclear Pt-complexes.

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Ummathur, Muhammed, Damodaran Babu, and Krishnannair Krishnankutty. "Heteroarylazo derivatives of cyclohexane-1,3-dione and their metal complexes." Journal of the Serbian Chemical Society 79, no. 3 (2014): 303–11. http://dx.doi.org/10.2298/jsc121227042u.

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The coupling of diazotized 2-aminothiazole and 2-aminobenzo-thiazole with cyclohexane-1,3-dione yielded a new type of tridentate ligand systems (HL). Analytical, IR, 1H NMR, 13C NMR and mass spectral data indicate the existence of the compounds in the intramolecularly hydrogen bonded azo-enol tautomeric form. Monobasic tridentate coordination of the compounds in their [CuL(OAc)] and [ML2] complexes [M = Ni(II) and Zn(II)] has been established on the basis of analytical and spectral data. The Zn(II) chelates are diamagnetic while Cu(II) and Ni(II) complexes showed normal paramagnetic moment.

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Journal articles on the topic 'Metal complexes Coordination compounds'

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