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Journal articles on the topic 'Metal complexes Metal complexes Ligands'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Sethi, Pooja, Rajshree Khare, and Renuka Choudhary. "Complexes of Pyrimidine Thiones: Mechanochemical Synthesis and Biological Evaluation." Asian Journal of Chemistry 32, no. 10 (2020): 2594–600. http://dx.doi.org/10.14233/ajchem.2020.22813.

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A new series of metal complexes with 1-(2-methylphenyl)-4,4,6-trimethyl pyrimidine-2-thione (2-HL1) and 1-(4-methylphenyl)-4,4,6-trimethyl pyrimidine-2-thione (4-HL2) ligands, [M(mppt)2(H2O)n] (M(II) = Cu, Mn, Co; n = 2 and M(II) = Ni, Zn; n = 0) have been synthesized using mechanochemical protocol. The complexes have been framed as [M(mppt)2(H2O)n] due to 1:2 (metal:ligand) nature of these metal complexs. Structures have been further confirmed on the basis of elemental analysis, Magnetic susceptibility measurements, electronic, infrared, far infrared, proton NMR, Mass spectral moment and thermogravimetric analysis studies. The infrared spectral data suggested that ligand behaves as a bidentate, coordinating through – N (endocyclic) and – S (exocyclic) donor atoms. All the compounds have also been screened for antibacterial and DNA photocleavage potential. Ligands complexed with Mn and Ni metals have shown the effect of substitution on their biological potentials. It was found that substitution at 4th or para position makes the ligand and its metal complexes have better antibacterial and DNA photocleaving agents.

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2

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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3

Pierpont, Cortlandt G., and Attia S. Attia. "Spin Coupling Interactions in Transition Metal Complexes Containing Radical o-Semiquinone Ligands. A Review." Collection of Czechoslovak Chemical Communications 66, no. 1 (2001): 33–51. http://dx.doi.org/10.1135/cccc20010033.

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Transition metal complexes ofo-semiquinone (SQ) ligands have been studied extensively over the past 25 years. A particularly interesting aspect of this coordination chemistry concerns magnetic interactions between paramagnetic metal ions and the radical anionic ligands. In this review we begin with a survey of relatively simple complexes consisting of a paramagnetic metal ion chelated by a single SQ ligand. Recent studies have revealed the importance of SQ-SQ coupling through diamagnetic metals, and complexes of this class are described in the second section of the review. Both interactions combine to account for the often complicated magnetic properties of complexes containing multiple SQ ligands chelated to a paramagnetic metal ion. Research on these complexes is surveyed in the third section with a concluding look toward polymeric SQ complexes. A review with 51 references.

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4

Salassa, Giovanni, and Alessio Terenzi. "Metal Complexes of Oxadiazole Ligands: An Overview." International Journal of Molecular Sciences 20, no. 14 (July 16, 2019): 3483. http://dx.doi.org/10.3390/ijms20143483.

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Oxadizoles are heterocyclic ring systems that find application in different scientific disciplines, from medicinal chemistry to optoelectronics. Coordination with metals (especially the transition ones) proved to enhance the intrinsic characteristics of these organic ligands and many metal complexes of oxadiazoles showed attractive characteristics for different research fields. In this review, we provide a general overview on different metal complexes and polymers containing oxadiazole moieties, reporting the principal synthetic approaches adopted for their preparation and showing the variety of applications they found in the last 40 years.

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5

Mustapha, Abdullahi, John Reglinski, and Alan R. Kennedy. "Metal complexes as potential ligands: The deprotonation of aminephenolate metal complexes." Inorganic Chemistry Communications 13, no. 4 (April 2010): 464–67. http://dx.doi.org/10.1016/j.inoche.2010.01.009.

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6

Garnovskii, A. D., B. I. Kharisov, L. M. Blanco, A. P. Sadimenko, A. I. Uraev, I. S. Vasilchenko, and D. A. Garnovskii. "Review: Metal Complexes as Ligands." Journal of Coordination Chemistry 55, no. 10 (January 1, 2002): 1119–34. http://dx.doi.org/10.1080/0095897021000022195.

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7

Buchler, Johann W., Frank M. K�nzel, Uwe Mayer, and Michaela Nawra. "Metal complexes with tetrapyrrole ligands." Fresenius' Journal of Analytical Chemistry 348, no. 5-6 (1994): 371–76. http://dx.doi.org/10.1007/bf00323137.

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8

Enders, Dieter, Heike Gielen, and Klaus Breuer. "Axial Chirality in Square-Planar Metal Complexes." Zeitschrift für Naturforschung B 53, no. 9 (September 1, 1998): 1035–38. http://dx.doi.org/10.1515/znb-1998-0916.

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Metal complexes with a square-planar arrangement of ligands are frequently found for the late Transition Metals. The incorporation of C1-symmetrical planar ligands (e.g. nucleophilic carbenes) in an orientation perpendicular to the square-plane of the complex leads to various isomers which are characterized by means of an axis of chirality employing the well established Cahn-Ingold-Prelog -R/S-nomenclature.

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9

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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10

Mamedova, Shafa Agаеvna. "METAL COMPLEX CATALYSIS." Globus 7, no. 5(62) (August 4, 2021): 31–33. http://dx.doi.org/10.52013/2658-5197-62-5-7.

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Complexes of transition metals with chiral ligands are considered as catalysts. Among metal-containing organic complexes with semiconducting properties, compounds of the porphin series occupy a special place in electrocatalytic studies. The properties of the porphyrin macrocycle, their role in catalysis, and the influence of the nature of the metal on the catalytic properties of the complex are considered.

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11

Aragay, Gemma, Josefina Pons, Jordi García-Antón, Ángeles Mendoza, Guillermo Mendoza-Díaz, Teresa Calvet, Mercè Font-Bardia, and Josep Ros. "Synthesis and Characterization of New Palladium(II) Complexes Containing N-Alkylamino-3,5-diphenylpyrazole Ligands. Crystal Structure of [PdCl(L2)](BF4) {L2 = Bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine}." Australian Journal of Chemistry 62, no. 5 (2009): 475. http://dx.doi.org/10.1071/ch08521.

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In this paper, the synthesis of two new N,N′,N-ligands, bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]amine (L1) and bis[2-(3,5-diphenyl-1-pyrazolyl)ethyl]ethylamine (L2) is reported. These ligands form complexes with the formula [PdCl(N,N′,N)]Cl when reacting with [PdCl2(CH3CN)2] in a 1:1 metal-to-ligand molar ratio. Treatment of these ligands with [PdCl2(CH3CN)2] in a 1:1 metal-to-ligand molar ratio in the presence of AgBF4 or NaBF4 gave [PdCl(N,N′,N)](BF4) complexes. These PdII complexes were characterized by elemental analyses, conductivity measurements, mass spectrometry, and IR, 1H, and 13C{1H} NMR spectroscopies. The X-ray structure of the complex [PdCl(L2)](BF4) has been determined. The metal atom is coordinated by two azine nitrogen atoms and one amine nitrogen atom of the aminopyrazole ligand. The distorted square planar coordination is completed by one chlorine atom. In this complex, intermolecular π–π stacking interactions are present.

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12

Misirlic-Dencic, Sonja, Jelena Poljarevic, Andjelka M. Isakovic, Tibor Sabo, Ivanka Markovic, and Vladimir Trajkovic. "Current Development of Metal Complexes with Diamine Ligands as Potential Anticancer Agents." Current Medicinal Chemistry 27, no. 3 (February 19, 2020): 380–410. http://dx.doi.org/10.2174/0929867325666181031114306.

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Background:: The discovery of cisplatin and the subsequent research revealed the importance of dinitrogen-containing moiety for the anticancer action of metal complexes. Moreover, certain diamine ligands alone display cytotoxicity that contributes to the overall activity of corresponding complexes. Objective:: To summarize the current knowledge on the anticancer efficacy, selectivity, and the mechanisms of action of metal complexes with various types of diamine ligands. Method:: The contribution of aliphatic acyclic, aliphatic cyclic, and aromatic diamine ligands to the anticancer activity and selectivity/toxicity of metal complexes with different metal ions were analyzed by comparison with organic ligand alone and/or conventional platinum-based chemotherapeutics. Results:: The aliphatic acyclic diamine ligands are present mostly in complexes with platinum. Aliphatic cyclic diamines are part of Pt(II), Ru(II) and Au(III) complexes, while aromatic diamine ligands are found in Pt(II), Ru(II), Pd(II) and Ir(III) complexes. The type and oxidation state of metal ions greatly influences the cytotoxicity of metal complexes with aliphatic acyclic diamine ligands. Lipophilicity of organic ligands, dependent on alkyl-side chain length and structure, determines their cellular uptake, with edda and eddp/eddip ligands being most useful in this regard. Aliphatic cyclic diamine ligands improved the activity/toxicity ratio of oxaliplatin-type complexes. The complexes with aromatic diamine ligands remain unexplored regarding their anticancer mechanism. The investigated complexes mainly caused apoptotic or necrotic cell death. Conclusion:: Metal complexes with diamine ligands are promising candidates for efficient and more selective alternatives to conventional platinum-based chemotherapeutics. Further research is required to reveal the chemico-physical properties and molecular mechanisms underlying their biological activity.

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13

Alghamdi, Israa A., Mohamed Abdelbaset, and Ines El Mannoubi. "Mixed Ligand Complexes of Copper(II) and Cobalt(II) with Hydrazones Derivatives and ortho-Vanillin: Syntheses, Characterizations and Antimicrobial Activity." Oriental Journal of Chemistry 35, no. 6 (December 30, 2019): 1722–30. http://dx.doi.org/10.13005/ojc/350614.

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The purpose of this paper was to synthesis new mixed-ligand Cu(II) and Co(II) metal complexes utilizing bidentate and tridentate donor hydrazones derivatives as primary ligands and o-vanillin as co-ligand. The obtained compounds were characterized by elemental analysis, Infrared, UV-Vis., 1H-NMR, Mass spectra, molar conductance, thermal analysis and atomic absorption spectroscopy (ASS). Spectroscopic analysis results indicated that the hydrazone ligand (L1) behave as tridentate (ONO) and forms metal complexes having distorted square planar geometry. While the ligands (L2, L3 AND L4) behave as bidentate (NO) and forms metal complexes having octahedral geometry around the central metal atoms. The antimicrobial potentials were assessed for the ligand (L2) and its metal complexes only and were screened against six types of bacterial strains and one fungal strain. The antimicrobial activities results of the tested compounds showed enhanced activity of the complexes over their parent ligands.

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14

KAKKAR, RITA, MAMTA BHANDARI, and RITU GABA. "DFT STUDY OF SOME TRIVALENT d- AND f-BLOCK METAL ION COMPLEXES OF ALLOXAN." Journal of Theoretical and Computational Chemistry 12, no. 06 (September 2013): 1350052. http://dx.doi.org/10.1142/s0219633613500521.

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Density functional calculations have been employed to elucidate the structures of some six coordinated complexes of alloxan monohydrate with some d- and f-block metals. Alloxan monohydrate may exist in the mono-ionized or di-ionized form in its complexes, and both states were investigated. It is found that when the metal ion is coordinated to three bidentate ligands, the structures are nearly trigonal prismatic, but replacement of a bidendate ligand by two monovalent ligands changes the geometry to deformed octahedral. The metal-alloxanate bonding is largely ionic for the lanthanoids. The calculated vibrational frequencies are in agreement with the experimentally determined ones.

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15

Sasmal, Ashok, Eugenio Garribba, Carlos J. Gómez-García, Cédric Desplanches, and Samiran Mitra. "Switching and redox isomerism in first-row transition metal complexes containing redox active Schiff base ligands." Dalton Trans. 43, no. 42 (2014): 15958–67. http://dx.doi.org/10.1039/c4dt01699h.

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Switching and redox isomerism in first row transition metal complexes through the metal-to-ligand or ligand-to-ligand electron transfer stabilize redox isomeric forms in transition metal complexes with redox-active ligands.

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16

Ye-gao, Yin, Huang Zu-yun, Cheung Kung-kai, and Wong Wing-tak. "Ligand-metal interaction in transition-metal complexes with tripodal polyaza ligands." Wuhan University Journal of Natural Sciences 4, no. 4 (December 1999): 477–81. http://dx.doi.org/10.1007/bf02832289.

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17

Gwaram, N. S., A. Salisu, and Muhammad Manir. "GREEN SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL STUDIES OF MIXED LIGAND COMPLEXES OF Co (II), Ni (II) and V(III) METALS USING SOME AMINO ACIDS AS LIGANDS." FUDMA JOURNAL OF SCIENCES 4, no. 4 (June 12, 2021): 191–99. http://dx.doi.org/10.33003/fjs-2020-0404-471.

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Co (II), Ni (II) and V (III) metal complexes were synthesized mechanochemically using L-Leucine, L-Tyrosine and Creatinine as mixed ligands. The metals and the ligands were grounded using an agate mortar with a pestle. The compounds formed were characterized using their melting/decomposition temperature, solubility, magnetic susceptibility, conductivity measurement, Infrared analysis and scanning electron microscope (SEM). The Metal – ligand ratios were investigated via Job’s method of continuous variation. The shifts of bands (for instance 1693-1677 cm-1 to 1674-1607 cm-1) in C=O and the appearance of new bands in the complexes (683-669 and 713-750 cm-1 indicates the complexation. The lower conductivity measurement values (15.00 to 32.40) µS.cm-1 suggested the non-electrolytic nature of the complexes. The magnetic effective value of the metal complexes showed that all the three complexes are paramagnetic and octahedral. It was concluded that the amino acids (ligands) coordinated in a bidentate way through the nitrogen from the amino group and oxygen from carboxylate. The complexes were screened for their antimicrobial activities against two bacterial isolates (Streptococcus pneumoniae and Klebsiella pneumoniae). All the complexes exhibited good activity against the organisms

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18

Al-Mandhary, Muna R. A., Christopher M. Fitchett, and Peter J. Steel. "Discrete Metal Complexes of Two Multiply Armed Ligands." Australian Journal of Chemistry 59, no. 5 (2006): 307. http://dx.doi.org/10.1071/ch06116.

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The syntheses and metal complexes of 1,2,4,5-tetrakis(8-quinolyloxymethyl)benzene 1 and hexakis(8-quinolyloxymethyl)benzene 2 are described. X-Ray crystal structures are reported of the free ligand 1, a binuclear silver(i) and a tetranuclear copper(i) complex of 1, as well as a binuclear cobalt(ii) and trinuclear palladium(ii) and silver(i) complexes of 2. Within these discrete metal complexes the ligands are found to adopt a range of coordination modes, with considerable variation in the relative orientations of the ligand arms as a result of the flexibility imparted by the CH2O linker units.

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19

Casellato, U., P. Guerriero, S. Tamburini, and P. A. Vigato. "Metal complexes with disubstituted oxamidic ligands." Inorganica Chimica Acta 260, no. 1 (July 1997): 1–9. http://dx.doi.org/10.1016/s0020-1693(96)05520-x.

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20

Petrović, A. F., S. R. Lukić, D. M. Petrović, E. Z. Ivegeš, and V. M. Leovac. "Metal complexes with pyrazole-derived ligands." Journal of Thermal Analysis 47, no. 3 (September 1996): 879–86. http://dx.doi.org/10.1007/bf01981822.

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21

Crutchley, R. "Phenylcyanamide ligands and their metal complexes." Coordination Chemistry Reviews 219-221 (October 2001): 125–55. http://dx.doi.org/10.1016/s0010-8545(01)00324-1.

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22

Sellmann, Dieter, Herbert Binder, Daniel Häußinger, Frank W. Heinemann, and Jörg Sutter. "Transition metal complexes with sulfur ligands." Inorganica Chimica Acta 300-302 (April 2000): 829–36. http://dx.doi.org/10.1016/s0020-1693(99)00608-8.

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23

Butin, Kim P., Elena K. Beloglazkina, and Nikolai V. Zyk. "Metal complexes with non-innocent ligands." Russian Chemical Reviews 74, no. 6 (June 30, 2005): 531–53. http://dx.doi.org/10.1070/rc2005v074n06abeh000977.

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24

Bowlas, C. J., A. E. Underhill, and D. Thetford. "Metal Complexes of Sulphur-Donor Ligands." Phosphorus, Sulfur, and Silicon and the Related Elements 67, no. 1-4 (April 1, 1992): 301–4. http://dx.doi.org/10.1080/10426509208045851.

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25

Wrackmeyer, Bernd. "Metal Complexes Bearing Terminal Borylene Ligands." Angewandte Chemie International Edition 38, no. 6 (March 15, 1999): 771–72. http://dx.doi.org/10.1002/(sici)1521-3773(19990315)38:6<771::aid-anie771>3.0.co;2-v.

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26

Madalan, Augustin M., Narcis Avarvari, and Marius Andruh. "Metal complexes as second-sphere ligands." New Journal of Chemistry 30, no. 4 (2006): 521. http://dx.doi.org/10.1039/b517989k.

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27

Buchanan, R. M. "Binuclear metal complexes containing polyimidazole ligands." Journal of Inorganic Biochemistry 51, no. 1-2 (July 1993): 444. http://dx.doi.org/10.1016/0162-0134(93)85472-k.

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28

Shiu, Kom-Bei, and Li-Yun Lee. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 348, no. 3 (July 1988): 357–60. http://dx.doi.org/10.1016/0022-328x(88)80417-0.

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29

Shiu, Kom-Bei, Kuen-Song Liou, Sue-Lein Wang, C. P. Cheng, and Fang-Jy Wu. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 359, no. 1 (January 1989): C1—C4. http://dx.doi.org/10.1016/0022-328x(89)85260-x.

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30

Shiu, Kom-Bei, Fuw-Ming Shen, Sue-Lein Wang, and Shi-Chen Wei. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 372, no. 2 (August 1989): 251–61. http://dx.doi.org/10.1016/0022-328x(89)87099-8.

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Shiu, Kom-Bei, Sue-Lein Wang, and Fen-Ling Liao. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 420, no. 2 (December 1991): 207–15. http://dx.doi.org/10.1016/0022-328x(91)80263-j.

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Shiu, Kom-Bei, Cho-Jin Chang, Yu Wang, and Ming-Chu Cheng. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 406, no. 3 (April 1991): 363–69. http://dx.doi.org/10.1016/0022-328x(91)83124-m.

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Shiu, Kom-Bei, Kuang-Hway Yih, Sue-Lein Wang, and Fen-Ling Liao. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 414, no. 2 (August 1991): 165–76. http://dx.doi.org/10.1016/0022-328x(91)86099-c.

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Shiu, Kom-Bei, Cho-Jin Chang, Sue-Lein Wang, and Fen-Ling Liao. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 407, no. 2 (April 1991): 225–35. http://dx.doi.org/10.1016/0022-328x(91)86120-f.

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Shiu, Kom-Bei, Kuang-Hway Yih, Sue-Lein Wang, and Fen-Ling Liao. "Organotransition-metal complexes of multidentate ligands." Journal of Organometallic Chemistry 420, no. 3 (February 1991): 359–70. http://dx.doi.org/10.1016/0022-328x(91)86464-2.

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Tamm, Matthias, and F. Ekkehardt Hahn. "Metal complexes with tripodal triisocyanide ligands." Journal of Inorganic Biochemistry 43, no. 2-3 (August 1991): 632. http://dx.doi.org/10.1016/0162-0134(91)84603-7.

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37

Sivaev, Igor B., Marina Yu Stogniy, and Vladimir I. Bregadze. "Transition metal complexes with carboranylphosphine ligands." Coordination Chemistry Reviews 436 (June 2021): 213795. http://dx.doi.org/10.1016/j.ccr.2021.213795.

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38

Prananto, Yuniar P., Aron Urbatsch, Boujemaa Moubaraki, Keith S. Murray, David R. Turner, Glen B. Deacon, and Stuart R. Batten. "Transition Metal Thiocyanate Complexes of Picolylcyanoacetamides." Australian Journal of Chemistry 70, no. 5 (2017): 516. http://dx.doi.org/10.1071/ch16648.

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A variety of transition metal complexes involving picolylcyanoacetamides (pica = NCCH2CONH-R; R = 2-picolyl- (2pica), 3-picolyl- (3pica), 4-picolyl- (4pica)) and thiocyanate have been synthesised and their solid-state structures have been determined. The complexes were all obtained from reactions between the corresponding metals salts and pica ligands with sodium thiocyanate under ambient conditions. Both 3pica and 4pica coordinate to the metal solely through the nitrogen atom of the picolyl group and form discrete tetrahedral [M(NCS)2(pica)2] (3pica; M = Mn, Zn; 4pica; M = Co) and octahedral [M(NCS)2(3pica)4] (M = Co, Fe, Ni) complexes. In addition, one-dimensional N,S-thiocyanate-bridged coordination polymers poly-[M(µ-NCS)2(pica)2] (3pica; M = Cd; 4pica; M = Co, Cd) were obtained. The ligand 2pica gave the discrete octahedral complexes [Co(NCS)2(2pica)2] and [Cd(NO3)2(2pica)2] in which 2pica chelates in a bidentate fashion through its picolyl and carbonyl groups. Magnetic susceptibility measurements on the cobalt(ii) complexes were performed and showed short-range antiferromagnetic coupling for the [Co(NCS)2(4pica)2]n 1D polymer.

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Zhao, Lili, Chaoqun Chai, Wolfgang Petz, and Gernot Frenking. "Carbones and Carbon Atom as Ligands in Transition Metal Complexes." Molecules 25, no. 21 (October 26, 2020): 4943. http://dx.doi.org/10.3390/molecules25214943.

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This review summarizes experimental and theoretical studies of transition metal complexes with two types of novel metal-carbon bonds. One type features complexes with carbones CL2 as ligands, where the carbon(0) atom has two electron lone pairs which engage in double (σ and π) donation to the metal atom [M]⇇CL2. The second part of this review reports complexes which have a neutral carbon atom C as ligand. Carbido complexes with naked carbon atoms may be considered as endpoint of the series [M]-CR3 → [M]-CR2 → [M]-CR → [M]-C. This review includes some work on uranium and cerium complexes, but it does not present a complete coverage of actinide and lanthanide complexes with carbone or carbide ligands.

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40

Hatua, Kaushik, and Prasanta K. Nandi. "Static second hyperpolarizability of Λ shaped alkaline earth metal complexes." Journal of Theoretical and Computational Chemistry 13, no. 05 (August 2014): 1450039. http://dx.doi.org/10.1142/s0219633614500394.

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A number of Λ shaped complexes of alkaline earth metals Be , Mg and Ca with varying terminal groups have been considered for the theoretical study of their second hyperpolarizability. The chosen complexes are found to be sufficiently stable and for a chosen ligand the stability decreases in the order: Be -complex > Ca -complex > Mg -complex. The calculated results of second hyperpolarizability obtained at different DFT functionals for the 6-311++G(d,p) basis set are found to be fairly consistent. The Λ shaped ligands upon complex formation with metals lead to strong enhancement of second hyperpolarizability. The highest magnitude of cubic polarizability has been predicted for the metal complex having > C ( C 2 H 5)2 group. For a chosen ligand, the magnitude of second hyperpolarizability increases in the order Be -complex < Mg -complex < Ca -complex which is the order of increasing size and electropositive character of the metal. The variation of second hyperpolarizability among the investigated metal complexes has been explained in terms of the transition energy and transition moment associated with the most intense electronic transition.

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Hanan, Garry S., Dirk Volkmer, and Jean-Marie Lehn. "Coordination arrays Synthesis and characterization of tetranuclear complexes of grid-type." Canadian Journal of Chemistry 82, no. 10 (October 1, 2004): 1428–34. http://dx.doi.org/10.1139/v04-092.

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A series of tetranuclear metal complexes of grid-type consisting of four bis-tridentate ligands and four divalent transition metal ions were synthesized and characterized. The 1H NMR spectra of diamagnetic complexes containing Zn(II), Cd(II), Fe(II), and Ru(II) was correlated to the radius of the metal ion. The UVvis and electrochemical results indicated that the bridging ligand π* orbital and the dπ metal orbital are stabilized by complexation of more than one metal ion. Furthermore, the Co(II) and Fe(II) grids exhibit metalmetal interaction mediated by the bis-tridentate ligands as indicated by electrochemical and spectroscopic methods. These results provide guidelines for the design of larger grids bearing several metal centres in a square arrangement, which also represent potential components of molecular electronic devices.Key words: complexes with nitrogen ligands, octahedral metal ions, self-assembly, supramolecular chemistry.

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Patel, Dipti, and Stephen T. Liddle. "f-Element-metal bond chemistry." Reviews in Inorganic Chemistry 32, no. 1 (June 1, 2012): 1–22. http://dx.doi.org/10.1515/revic.2012.0001.

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AbstractCompared to the overwhelming prevalence of f-element-carbon, -nitrogen, -oxygen or -halide ligand linkages, the use of metal-based fragments as ligands is underdeveloped. This contrasts directly to the extensively developed fields of d- and p-block metal-metal complexes, which are still burgeoning. This review outlines the development of compounds that possess polarised covalent f-element-metal bonds. For this review, the f-element is defined as (i) a group 3 metal; (ii) a lanthanide metal; (iii) the actinide metals thorium or uranium. The metal is defined as: (i) a d-block transition metal; (ii) a group 13 metal (aluminium or gallium); (iii) a group 14 metal (silicon, germanium or tin); (iv) a group 15 metal (antimony or bismuth) metal. Although silicon, germanium and antimony are traditionally classified as metalloids, they are included for completeness. We focus on complexes that have been structurally authenticated by single crystal X-ray diffraction, and we highlight novel aspects of their syntheses, properties and reactivities.

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Fohlmeister, Lea, and Andreas Stasch. "Alkali Metal Hydride Complexes: Well-Defined Molecular Species of Saline Hydrides." Australian Journal of Chemistry 68, no. 8 (2015): 1190. http://dx.doi.org/10.1071/ch15206.

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The first examples of well-defined alkali metal hydride complexes have been synthesised and characterised in recent years, and their properties and underlying principles for their generation and stabilisation are emerging. This article gives an account of the hydrides of the alkali metals (Group 1 metals) and selected ‘-ate’ complexes containing hydrides and alkali metals, and reviews the chemistry of well-defined alkali metal hydride complexes including their syntheses, structures, and characteristics. The properties of the alkali metal hydrides LiH, NaH, KH, RbH, and CsH are dominated by their ionic NaCl structure. Stable, soluble, and well-defined LiH and NaH complexes have been obtained by metathesis and β-hydride elimination reactions that require suitable ligands with some steric bulk and the ability to coordinate to several metal ions. These novel hydride complexes reward with higher reactivity and different properties compared with their parent ionic solids.

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Nabeshima, Tatsuya, Yusuke Chiba, Takashi Nakamura, and Ryota Matsuoka. "Synthesis and Functions of Oligomeric and Multidentate Dipyrrin Derivatives and their Complexes." Synlett 31, no. 17 (July 24, 2020): 1663–80. http://dx.doi.org/10.1055/s-0040-1707155.

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The dipyrrin–metal complexes and especially the boron complex 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) have recently attracted considerable attention because of their interesting properties and possible applications. We have developed two unique and useful ways to extend versatility and usefulness of the dipyrrin complexes. The first one is the linear and macrocyclic oligomerization of the BODIPY units. These arrangements of the B–F moieties of the oligomerized BODIPY units provide sophisticated functions, such as unique recognition ability toward cationic guest, associated with changes in the photophysical properties by utilizing unprecedented interactions between the B–F and a cationic species. The second one is introduction of additional ligating moieties into the dipyrrin skeleton. The multidentate N2Ox dipyrrin ligands thus obtained form a variety of complexes with 13 and 14 group elements, which are difficult to synthesize using the original N2 dipyrrin derivatives. Interestingly, these unique complexes exhibit novel structures, properties, and functions such as guest recognition, stimuli-responsive structural conversion, switching of the optical properties, excellent stability of the neutral radicals, etc. We believe that these multifunctional dipyrrin complexes will advance the basic chemistry of the dipyrrin complexes and develop their applications in the materials and medicinal chemistry fields.1 Introduction2 Linear Oligomers of Boron–Dipyrrin Complexes3 Cyclic Oligomers of Boron–Dipyrrin Complexes4 A Cyclic Oligomer of Zinc–Dipyrrin Complexes5 Group 13 Element Complexes of N2Ox Dipyrrins6 Chiral N2 and N2Ox Dipyrrin Complexes7 Group 14 Element Complexes of N2O2 Dipyrrins8 Other N2O2 Dipyrrin Complexes with Unique Properties and Functions9 Conclusion

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Rajeswari S, Harindran Suhana, and Kalaivizhi R. "Studies on the Spectral, Anti-Bacterial and Anti-Fungal Activities of 1-((Dicyclohexylamino) (Phenyl) Methyl) Pyrrolidine-2, 5-Dione and Few of its Metal Complexes." International Journal of Research in Pharmaceutical Sciences 11, SPL4 (December 21, 2020): 3124–36. http://dx.doi.org/10.26452/ijrps.v11ispl4.4653.

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1-((dicyclohexylamino)(phenyl)methyl) pyrrolidine-2,5-dione (SDB) has been synthesized as a result of succinimide, benzaldehyde and dicyclohexylamine Mannich base condensation and its CoII, NiII and CuII complexes were prepared. The structure of the Mannich Base ligand (SDB) was elucidated on the basis of FT-IR, 1H NMR, 13C NMR and Mass spectral studies. The monomeric and non-electrolytic nature of the metal complexes is evidenced by their magnetic susceptibility and low conductance data studies. Spectral tests, mainly FT-IR studies as well as elemental analysis, were carried out to verify the structures of the newly synthesized compounds. All the metal complexes possess a six-coordinate geometry. The synthesized ligand and its metal complexes have been tested against Gram-positive strains (Staphylococcus aureus and Micrococcus luteus), Gram-negative strains (Escherichia coli and Pseudomonas aeruginosa) and fungal strains (Aspergillus niger and Aspergillus fumigates) for their in vitro anti-bacterial and anti-fungal activities. Preliminary antimicrobial studies of the ligand and their metal complexes have also been carried out in order to understand the toxic effect of ligands and metal complexes against the selective microbes. The results showed that the metal chelates of the ligands showed higher antimicrobial activities than the free ligand SDB and CoII complexes possess higher activity than the other metal complexes.

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Klingele, Julia, Sebastian Dechert, and Franc Meyer. "Polynuclear transition metal complexes of metal⋯metal-bridging compartmental pyrazolate ligands." Coordination Chemistry Reviews 253, no. 21-22 (November 2009): 2698–741. http://dx.doi.org/10.1016/j.ccr.2009.03.026.

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Sellmann, Dieter, Gerhard Freyberger, and Matthias Moll. "Übergangsmetallkomplexe mit Schwefelliganden, XLVIa. Zn-, Cd-, Hg-, Sn-, Pb-, Sb-, Bi- und Ti-Komplexe mit den zwei- und vierzähnigen Thiolatliganden 'buS2'2- = 3,5-Di(t-butyl)benzol-1,2-dithiolat(2—), 'S4'2- = 1,2-Bis(2-mercaptophenylthio)ethan(2—) und 'buS4'2- = 1,2-Bis(3,5-di(t-butyl)-2-mercaptophenylthio)ethan(2–) / Transition Metal Complexes with Sulfur Ligands, XLVIa. Zn, Cd, Hg, Sn, Pb, Bi and Ti Complexes with the Bi- and Tetradentate Thiolato Ligands 'buS2'2- = 3,5-Di(t-butyl)benzene-1,2-dithiolate(2–), 'S4'2 = 1,2-Bis(2-mercaptophenylthio)ethane(2–) and 'buS4'2- = 1,2-Bis(3,5-di(t-butyl)-2-mercaptophenylthio)ethane(2 – )." Zeitschrift für Naturforschung B 44, no. 9 (September 1, 1989): 1015–22. http://dx.doi.org/10.1515/znb-1989-0905.

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Syntheses of neutral 'buS2'-, 'S4'- and 'buS4'- and of anionic .buS2-complexes with various main group and transition metals are described. The complexes were prepared by reacting the neutral sulfur ligands or their alkali salts with the metal halide or alkoxide. The ligands coordinate to metal ions in normal as well as high oxidation states. No redox reactions occur in the latter case. The complexes are usually soluble in organic solvents and were characterized by elemental analysis and spectroscopic means.

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BUCHLER, JOHANN W. "Coordination chemistry of metal tetrapyrrole complexes — unusual geometries and stoichiometries." Journal of Porphyrins and Phthalocyanines 04, no. 04 (June 2000): 337–39. http://dx.doi.org/10.1002/(sici)1099-1409(200006/07)4:4<337::aid-jpp228>3.0.co;2-2.

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Sets of metal tetrapyrrole complexes are presented in which unusual geometries and/or stoichiometries occur as compared with the usual distorted octahedral structures and molar 1:1 ratio of metal and tetrapyrrole ligand normally found in metal complexes of porphyrins, phthalocyanines or other tetrapyrrole ligands (hydroporphyrins, corroles, etc.).

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Výprachtický, Drahomír, Věra Cimrová, Stanislav Kukla, and Luďka Machová. "Luminescent Terbium Complexes with Polymer Ligands." Collection of Czechoslovak Chemical Communications 69, no. 2 (2004): 309–21. http://dx.doi.org/10.1135/cccc20040309.

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Alternating and statistical copolymers of 9-vinylcarbazole with diethyl fumarate (1), diethyl maleate (2), methacrylic acid (3), maleic anhydride (4), or maleic acid (5) were synthesized and characterized. These copolymers were tested as polymer ligands, that might be able to suppress the environmental vibronic quenching of a lanthanide ion and, simultaneously, to function as energy donors in the ligand-to-metal energy transfer processes. Time-resolved luminescence of a series of [Tb(III)-ligand] complexes in common and deuterated solvents revealed that the complexing properties of copolymers 3 or 5 are stronger than those of 1 or 2. Consequently, the strong binding affinity decreases the ligand-metal (donor-acceptor) distance and gives rise to an efficient ligand-to-metal energy transfer. Thus, the intensities of the long-lived emission (5D4→7F6, 5D4→7F5, 5D4→7F4, 5D4→7F3) of the [Tb(III)-3], [Tb(III)-5], and [Tb(III)-1] or [Tb(III)-2] complexes were found to be eight times, five times, and less than twice that of uncomplexed Tb3+, respectively.

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Loginova, Natalia V., Hleb I. Harbatsevich, Nikolai P. Osipovich, Galina A. Ksendzova, Tatsiana V. Koval’chuk, and Genrikh I. Polozov. "Metal Complexes as Promising Agents for Biomedical Applications." Current Medicinal Chemistry 27, no. 31 (September 11, 2020): 5213–49. http://dx.doi.org/10.2174/0929867326666190417143533.

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Background:: In this review article, a brief overview of novel metallotherapeutic agents (with an emphasis on the complexes of essential biometals) promising for medical application is presented. We have also focused on the recent work carried out by our research team, specifically the development of redox-active antimicrobial complexes of sterically hindered diphenols with some essential biometals (copper, zinc, nickel). Results:: The complexes of essential metals (manganese, iron, cobalt, nickel, copper, zinc) described in the review show diverse in vitro biological activities, ranging from antimicrobial and antiinflammatory to antiproliferative and enzyme inhibitory. It is necessary to emphasize that the type of organic ligands in these metal complexes seems to be responsible for their pharmacological activities. In the last decades, there has been a significant interest in synthesis and biological evaluation of metal complexes with redox-active ligands. A substantial step in the development of these redox-active agents is the study of their physicochemical and biological properties, including investigations in vitro of model enzyme systems, which can provide evidence on a plausible mechanism underlying the pharmacological activity. When considering the peculiarities of the pharmacological activity of the sterically hindered diphenol derivatives and their nickel(II), copper(II) and zinc(II) complexes synthesized, we took into account the following: (i) all these compounds are potential antioxidants and (ii) their antimicrobial activity possibly results from their ability to affect the electron-transport chain. Conclusion:: We obtained novel data demonstrating that the level of antibacterial and antifungal activity in the series of the above-mentioned metal-based antimicrobials depends not only on the nature of the phenolic ligands and complexing metal ions, but also on the lipophilicity and reducing ability of the ligands and metal complexes, specifically regarding the potential biotargets of their antimicrobial action – ferricytochrome c and the superoxide anion radical. The combination of antibacterial, antifungal and antioxidant activity allows one to consider these compounds as promising substances for developing therapeutic agents with a broad spectrum of activities.

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