Journal articles: 'Coordination compounds (Synthetic)'

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Tor, Yitzhak. "Coordination Compounds as Synthetic Building Blocks." Synlett 2002, no. 07 (2002): 1043–54. http://dx.doi.org/10.1055/s-2002-32571.

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Tor, Yitzhak. "ChemInform Abstract: Coordination Compounds as Synthetic Building Blocks." ChemInform 33, no. 36 (May 20, 2010): no. http://dx.doi.org/10.1002/chin.200236256.

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André, Vânia, Sílvia Quaresma, João Luís Ferreira da Silva, and M. Teresa Duarte. "Exploring mechanochemistry to turn organic bio-relevant molecules into metal-organic frameworks: a short review." Beilstein Journal of Organic Chemistry 13 (November 14, 2017): 2416–27. http://dx.doi.org/10.3762/bjoc.13.239.

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Mechanochemistry is a powerful and environmentally friendly synthetic technique successfully employed in different fields of synthetic chemistry. Application spans from organic to inorganic chemistry including the synthesis of coordination compounds. Metal-organic frameworks (MOFs) are a class of compounds with numerous applications, from which we highlight herein their application in the pharmaceutical field (BioMOFs), whose importance has been growing and is now assuming a relevant and promising domain. The need to find cleaner, greener and more energy and material-efficient synthetic procedures led to the use of mechanochemistry into the synthesis of BioMOFs.

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Gečiauskaitė, Agota A., and Felipe García. "Main group mechanochemistry." Beilstein Journal of Organic Chemistry 13 (October 5, 2017): 2068–77. http://dx.doi.org/10.3762/bjoc.13.204.

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Over the past decade, mechanochemistry has emerged as a powerful methodology in the search for sustainable alternatives to conventional solvent-based synthetic routes. Mechanochemistry has already been successfully applied to the synthesis of active pharmaceutical ingredients (APIs), organic compounds, metal oxides, coordination compounds and organometallic complexes. In the main group arena, examples of synthetic mechanochemical methodologies, whilst still relatively sporadic, are on the rise. This short review provides an overview of recent advances and achievements in this area that further validate mechanochemistry as a credible alternative to solution-based methods for the synthesis of main group compounds and frameworks.

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Quaresma, Sílvia, Paula C. Alves, Patrícia Rijo, M. Teresa Duarte, and Vânia André. "Antimicrobial Activity of Pyrazinamide Coordination Frameworks Synthesized by Mechanochemistry." Molecules 26, no. 7 (March 28, 2021): 1904. http://dx.doi.org/10.3390/molecules26071904.

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The urge for the development of a more efficient antibiotic crystalline forms led us to the disclosure of new antibiotic coordination frameworks of pyrazinamide, a well-known drug used for the treatment of tuberculosis, with some of the novel compounds unravelling improved antimycobacterial activity. Mechanochemistry was the preferred synthetic technique to yield novel compounds, allowing the reproduction of a 1D zinc framework, the synthesis of a novel hydrogen bonding manganese framework, and three new compounds with silver. The structural characterization of the novel forms is presented along with stability studies. The increased antimicrobial activity of the new silver-based frameworks against Escherichia coli, Staphylococcus aureus, and Mycobacterium smegmatis is particularly relevant.

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Đaković, Marijana, Željka Soldin, Boris-Marko Kukovec, Ivan Kodrin, Christer B. Aakeröy, Nea Baus, and Tamara Rinkovec. "Building inorganic supramolecular architectures using principles adopted from the organic solid state." IUCrJ 5, no. 1 (January 1, 2018): 13–21. http://dx.doi.org/10.1107/s2052252517015494.

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In order to develop transferable and practical avenues for the assembly of coordination complexes into architectures with specific dimensionality, a strategy utilizing ligands capable of simultaneous metal coordination and self-complementary hydrogen bonding is presented. The three ligands used, 2(1H)-pyrazinone, 4(3H)-pyrimidinone and 4(3H)-quinazolinone, consistently deliver the required synthetic vectors in a series of CdII coordination polymers, allowing for reproducible supramolecular synthesis that is insensitive to the different steric and geometric demands from potentially disruptive counterions. In all nine crystallographically characterized compounds presented here, directional intermolecular N—H...O hydrogen bonds between ligands on adjacent complex building blocks drive the assembly and orientation of discrete building blocks into largely predictable topologies. Furthermore, whether the solids are prepared from solution or through liquid-assisted grinding, the structural outcome is the same, thus emphasizing the robustness of the synthetic protocol. The details of the molecular recognition events that take place in this series of compounds have been clearly delineated and rationalized in the context of calculated molecular electrostatic potential surfaces.

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Mihajlović, T., and H. Effenberger. "The first proof of protonated anion tetrahedra in the tsumcorite-type compounds." Mineralogical Magazine 68, no. 5 (October 2004): 757–67. http://dx.doi.org/10.1180/0026461046850217.

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AbstractHydrothermal synthesis produced the new compound SrCo2(AsO4)(AsO3OH)(OH)(H2O). The compound belongs to the tsumcorite group (natural and synthetic compounds with the general formula M(1)M(2)2(XO4)2(H2O,OH)2; M(1)1+,2+,3+ = Na, K, Rb, Ag, NH4, Ca, Pb, Bi, Tl; M(2)2+,3+ = Al, Mn3+, Fe3+, Co, Ni, Cu, Zn; and X5+,6+ = P, As, V, S, Se, Mo). It represents (1) the first Sr member, (2) the until now unknown [7]-coordination for the M(1) position, (3) the first proof of (partially) protonated arsenate groups in this group of compounds, and (4) a new structure variant.The crystal structure of the title compound was determined using single-crystal X-ray diffraction data. The compound is monoclinic, space group P21/a, with a = 9.139(2), b = 12.829(3), c = 7.522(2) Å, β = 114.33(3)°, V = 803.6(3) Å3, Z = 4 [wR2 = 0.065 for 3530 unique reflections]. The hydrogen atoms were located experimentally.

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Cao, Tingting, Yanqiang Peng, Ting Liu, Suna Wang, Jianmin Dou, Yunwu Li, Changhui Zhou, Dacheng Li, and Junfeng Bai. "Assembly of a series of d10 coordination polymers of pamoic acid through a mixed-ligand synthetic strategy: syntheses, structures and fluorescence properties." CrystEngComm 16, no. 46 (2014): 10658–73. http://dx.doi.org/10.1039/c4ce01356e.

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Subitha, S., V. Gnana Glory Kanmoni, C. Isac Sobana Raj, J. Jona, and V. Vibi. "Synthesis, Characterization Study of Schiff Base Complexes Derived from Ampicillin and 4 Hydroxy3-Methoxy Benzaldehyde." Oriental Journal Of Chemistry 37, no. 4 (August 30, 2021): 813–18. http://dx.doi.org/10.13005/ojc/370407.

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Ampicillin is a derived form of pencillin which is emi synthetic -lactum antibiotic used to treat bladder infections, pneumonia, respiratory infection. schiff’s bases are the most widely studied chelating ligands in coordination chemistry. Recently metal complexes of schiff bases particularly derived from carbonyl compounds base on hetero-cyclic rings have been the centre of attraction in many areas. Present paper brief the synthesis of AHMBL and its transition metal (II) complexes and also the coordination / characterization studies such as magnetic susceptibility, molar conductance, Electronic spectra, Thermal study, FT-IR, H-NMR, XRD, and SEM .

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Dekkiche, Hervé, Yoshihiro Kikkawa, Lydia Karmazin, Christophe Jeandon, and Romain Ruppert. "Synthesis of porphyrins bearing alkynyl- or arylalkynyl-meso-groups." Journal of Porphyrins and Phthalocyanines 20, no. 01n04 (January 2016): 292–301. http://dx.doi.org/10.1142/s108842461650005x.

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The synthesis of new porphyrins bearing external coordination sites and long alkyl chains is described. In particular, the possibility to use the Sonogashira coupling to introduce long alkynyl chains and the synthetic pathway to obtain these compounds is detailed. Two crystal structures of these new porphyrin derivatives were obtained. The synthesis of porphyrin dimers linked by a palladium(II) ion is also reported and some electronic consequences presented.

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Dadashi, Jaber, Younes Hanifehpour, Babak Mirtamizdoust, Mehdi Abdolmaleki, Elham Mohammadi Jegarkandi, Mahboubeh Rezaei, and Sang Woo Joo. "Ultrasound-Assisted Synthesis and DFT Calculations of the Novel 1D Pb (II) Coordination Polymer with Thiosemicarbazone Derivative Ligand and Its Use for Preparation of PbO Clusters." Crystals 11, no. 6 (June 14, 2021): 682. http://dx.doi.org/10.3390/cryst11060682.

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In the present work, using a sonochemical method, a new lead (II) coordination 1D polymer, [Pb(L)2(CH3COO)]n (L = pyridine-4-carbaldehyde thiosemicarbazone) (1) was prepared. It was characterized structurally with different spectroscopic methods, such as SEM, IR spectroscopy, XRD, and elemental analysis. The coordination compound becomes a stair-step one-dimensional polymer in solid mode. The lead (II) ions have the coordination number of six (PbNS3O2) with two oxygen atoms from acetate anion and three sulfur atoms and one nitrogen atom from organic ligand. It contains a stereo-chemically active lone electron pair and the hemidirected coordination sphere. The high-intensity ultrasound is considered a flexible, environmentally friendly, and easy synthetic tool for the coordination compounds. PbO clusters was achieved with thermolyzing 1 at 180 ˚C with oleic acid (as a surfactant). Furthermore, the size and morphology of the created PbO clusters were assessed via SEM. The estimated gap of HOMO and LUMO is 3.275 eV based on DFT calculations.

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Krivovichev, Sergey V. "Polyoxometalate clusters in minerals: review and complexity analysis." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 76, no. 4 (July 14, 2020): 618–29. http://dx.doi.org/10.1107/s2052520620007131.

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Most research on polyoxometalates (POMs) has been devoted to synthetic compounds. However, recent mineralogical discoveries of POMs in mineral structures demonstrate their importance in geochemical systems. In total, 15 different types of POM nanoscale-size clusters in minerals are described herein, which occur in 42 different mineral species. The topological diversity of POM clusters in minerals is rather restricted compared to the multitude of moieties reported for synthetic compounds, but the lists of synthetic and natural POMs do not overlap completely. The metal–oxo clusters in the crystal structures of the vanarsite-group minerals ([As3+V4+ 2V5+ 10As5+ 6O51]7−), bouazzerite and whitecapsite ([M 3+ 3Fe7(AsO4)9O8–;n (OH) n ]), putnisite ([Cr3+ 8(OH)16(CO3)8]8−), and ewingite ([(UO2)24(CO3)30O4(OH)12(H2O)8]32−) contain metal–oxo clusters that have no close chemical or topological analogues in synthetic chemistry. The interesting feature of the POM cluster topologies in minerals is the presence of unusual coordination of metal atoms enforced by the topological restraints imposed upon the cluster geometry (the cubic coordination of Fe3+ and Ti4+ ions in arsmirandite and lehmannite, respectively, and the trigonal prismatic coordination of Fe3+ in bouazzerite and whitecapsite). Complexity analysis indicates that ewingite and morrisonite are the first and the second most structurally complex minerals known so far. The formation of nanoscale clusters can be viewed as one of the leading mechanisms of generating structural complexity in both minerals and synthetic inorganic crystalline compounds. The discovery of POM minerals is one of the specific landmarks of descriptive mineralogy and mineralogical crystallography of our time.

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Sidorov, Aleksey A., Natalia V. Gogoleva, Evgeniya S. Bazhina, Stanislav A. Nikolaevskii, Maksim A. Shmelev, Ekaterina N. Zorina-Tikhonova, Andrey G. Starikov, Mikhail A. Kiskin, and Igor L. Eremenko. "Some aspects of the formation and structural features of low nuclearity heterometallic carboxylates." Pure and Applied Chemistry 92, no. 7 (July 28, 2020): 1093–110. http://dx.doi.org/10.1515/pac-2019-1212.

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AbstractHeterometallic carboxylate complexes are of paramount interest in pure and applied coordination chemistry. Despite that plurality of such type compounds have been published to date, synthetic aspects of their chemistry often remain in the shadow of intriguing physical properties manifesting by these species. Present review summarizes reliable data on direct synthesis of low nuclearity molecular compounds as well as coordination polymers on their base with carboxylate-bridged {M2Mg} (M = Co2+, Ni2+, Cd2+), {M2Li2} (M = Co2+, Ni2+, Zn2+, VO2+), {M2Ln2} and {M2Ln} (M = Cu2+, Zn2+, Co2+) metal cores. Structural features and stabilization factors are considered and principal outcomes are confirmed by quantum-chemical calculations. Particular attention is paid to consideration of ligand-exchange reactions that allow controllable modification of heterometallic metal core under mild conditions giving diverse molecular complexes with modified ligand environment or Metal-Organic Frameworks with permanent porosity.

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14

Diel, B. N., and H. Hope. "Convenient synthetic route to coordination and organometallic compounds of alkanenitronate [O2N:CCR']- anions." Inorganic Chemistry 25, no. 24 (November 1986): 4448–51. http://dx.doi.org/10.1021/ic00244a034.

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15

Dudeja, Mamta, Rajesh Malhotra, and Kuldip Singh Dhindsa. "Synthetic and Biocidal Studies on Novel Coordination Compounds of Substituted 4,5-Dihydropyrazoles." Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 23, no. 6 (June 1993): 921–35. http://dx.doi.org/10.1080/15533179308016872.

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16

Sheikh, Khair-Un-Nisa, Hira Amin, Rosenani A. Haque, Aman Shah Abdul Majid, Muhammad Yaseen, and Muhammad Adnan Iqbal. "An overview of synthetic methodologies of organometallic and coordination compounds of gold." Journal of Coordination Chemistry 74, no. 1-3 (January 11, 2021): 467–542. http://dx.doi.org/10.1080/00958972.2020.1866176.

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17

Bombicz, Petra, Ewald Sattler, Ilona Kovács, Alexander Rothenberger, and Alexander Okrut. "From Neutral to Ionic Species: Studies of Li...P(SiMe3)-PtBu2Complexes." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C640. http://dx.doi.org/10.1107/s2053273314093590.

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The alkali and alkaline earth phosphanides have already been intensively studied, nonetheless there are only a few reports on the alkali metal diphosphanides, on their structural properties and their synthetic use as building blocks for the synthesis of phosphorus-rich compounds and, in particular, transition- metal complexes. This study extends the so far small family of lithium diphosphanides with the series of Li(L)nP-(SiMe3)-PtBu2, where L = THF, n = 0–3; L = TMEDA or 12-crown-4, n = 2. The coordination numbers of the Li ions are in the range of two to eight in the investigated compounds. There is a clear correlation between the Li-P distance and the coordination number of the Li atom. The higher the coordination number of the Li atom, the longer the Li–P distance is. Coordination numbers of four or higher lead to ionic structures. The influence of the space requirement of the phosphorus substituents on the Li-P bond length should also be taken into account especially in the case of coordination number two. Eight-membered ring structures are realized when the formation of four-membered rings is prevented by sterically demanding substituents. This work is a contribution to the fine tuning of structures by donor molecules and substituents [1].

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Constable, Edwin C., Richard M. Hartshorn, and Catherine E. Housecroft. "1,1′-Biisoquinolines—Neglected Ligands in the Heterocyclic Diimine Family That Provoke Stereochemical Reflections." Molecules 26, no. 6 (March 13, 2021): 1584. http://dx.doi.org/10.3390/molecules26061584.

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1,1′-Biisoquinolines are a class of bidentate nitrogen donor ligands in the heterocyclic diimine family. This review briefly discusses their properties and the key synthetic pathways available and then concentrates upon their coordination behaviour. The ligands are of interest as they exhibit the phenomenon of atropisomerism (hindered rotation about the C1–C1′ bond). A notation for depicting the stereochemistry in coordination compounds containing multiple stereogenic centers is developed. The consequences of the chirality within the ligand on the coordination behaviour is discussed in detail.

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Firmino, Ana D. G., Ricardo F. Mendes, Duarte Ananias, Jéssica S. Barbosa, João P. C. Tomé, and Filipe A. Almeida Paz. "Coordination Polymers Based on a Biphenyl Tetraphosphonate Linker: Synthesis Control and Photoluminescence." Molecules 25, no. 8 (April 16, 2020): 1835. http://dx.doi.org/10.3390/molecules25081835.

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In this work, we used the rigid tetrapodal organic linker, [1,1′-biphenyl]-3,3′,5,5′-tetrayltetrakis(phosphonic acid) (H8btp), for the preparation of two lanthanide–organic framework families of compounds: layered [Ln7(H5btp)4(H5.5btp)2(H6btp)2(H2O)12]∙23.5H2O∙MeOH [where Ln3+ = Eu3+ (1Eu) and Gd3+ (1Gd)], prepared using microwave-irradiation followed by slow evaporation; 3D [Ln4(H3btp)(H4btp)(H5btp)(H2O)8]∙3H2O [where Ln3+ = Ce3+ (2Ce), Pr3+ (2Pr), and Nd3+ (2Nd)], obtained from conventional hydro(solvo)thermal synthesis. It is shown that in this system, by carefully selecting the synthetic method and the metal centers, one can increase the dimensionality of the materials, also increasing structural robustness (particularly to the release of the various solvent molecules). Compound 1 is composed of 2D layers stacked on top of each other and maintained by weak π–π interactions, with each layer formed by discrete 1D organic cylinders stacked in a typical brick-wall-like fashion, with water molecules occupying the free space in-between cylinders. Compound 2, on the other hand, is a 3D structure with small channels filled with crystallization water molecules. A full solid-state characterization of 1 and 2 is presented (FT-IR spectroscopy, SEM microscopy, thermogravimetric studies, powder X-ray diffraction and thermodiffractometry). The photoluminescence of 1Eu was investigated.

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Vlasiou, Manolis C., and Kyriaki S. Pafiti. "Chromium Coordination Compounds with Antimicrobial Activity: Synthetic Routes, Structural Characteristics, and Antibacterial Activity." Open Medicinal Chemistry Journal 14, no. 1 (June 29, 2020): 1–25. http://dx.doi.org/10.2174/1874104502014010001.

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A major threat to public health worldwide is that the antimicrobial activity of the established drugs is constantly reduced due to the resistance that bacteria develop throughout the years. Some transition metal complexes show higher antibacterial activity against several bacteria compared to those of clinically used antibiotics. Novel classes of molecules provide new challenges and seem promising to solve the crisis that the overuse of antibiotics has led over the last years. This review discusses the challenges of chromium-based metallodrugs as antimicrobial agents. In particular, the synthetic routes, the structural characteristics, as well as the antimicrobial activity of 32 chromium (III) complexes have been presented.

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Passadis, Stamatis, Themistoklis Kabanos, Yu-Fei Song, and Haralampos Miras. "Self-Assembly in Polyoxometalate and Metal Coordination-Based Systems: Synthetic Approaches and Developments." Inorganics 6, no. 3 (July 13, 2018): 71. http://dx.doi.org/10.3390/inorganics6030071.

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Utilizing new experimental approaches and gradual understanding of the underlying chemical processes has led to advances in the self-assembly of inorganic and metal–organic compounds at a very fast pace over the last decades. Exploitation of unveiled information originating from initial experimental observations has sparked the development of new families of compounds with unique structural characteristics and functionalities. The main source of inspiration for numerous research groups originated from the implementation of the design element along with the discovery of new chemical components which can self-assemble into complex structures with wide range of sizes, topologies and functionalities. Not only do self-assembled inorganic and metal–organic chemical systems belong to families of compounds with configurable structures, but also have a vast array of physical properties which reflect the chemical information stored in the various “modular” molecular subunits. The purpose of this short review article is not the exhaustive discussion of the broad field of inorganic and metal–organic chemical systems, but the discussion of some representative examples from each category which demonstrate the implementation of new synthetic approaches and design principles.

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Golla, Upendarrao, Amit Adhikary, Amit Kumar Mondal, Raghuvir Singh Tomar, and Sanjit Konar. "Synthesis, structure, magnetic and biological activity studies of bis-hydrazone derived Cu(ii) and Co(ii) coordination compounds." Dalton Transactions 45, no. 29 (2016): 11849–63. http://dx.doi.org/10.1039/c6dt01496h.

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Three double stranded helicates and one linear chain compound have been synthesized following similar synthetic strategy with change in the coordination of the ligands. Magnetic studies, nuclease activity and cytotoxicity on mammalian cancer cell lines have been investigated.

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Maji, Tapas Kumar, and Susumu Kitagawa. "Chemistry of porous coordination polymers." Pure and Applied Chemistry 79, no. 12 (January 1, 2007): 2155–77. http://dx.doi.org/10.1351/pac200779122155.

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Remarkable advances in the recent development of porous compounds based upon coordination polymers have paved the way toward functional chemistry having potential applications such as gas storage, separation, and catalysis. From the synthetic point of view, the advantage is a designable framework, which can readily be constructed from building blocks, the so-called bottom-up assembly. Compared with conventional porous materials such as zeolites and activated carbons, porous inorganic-organic hybrid frameworks have higher potential for adsorption of small molecules because of their designability with respect to the coordination geometry around the central metal ion as well as size and probable multifunctionality of bridging organic ligands. Although rigidity and robustness of porous framework with different degree of adsorption are the most studied properties of metal-organic coordination frameworks, there are few studies on dynamic porous frameworks, which could open up a new dimension in materials chemistry.

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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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Husson, Jérôme, and Michael Knorr. "Syntheses and applications of furanyl-functionalised 2,2’:6’,2’’-terpyridines." Beilstein Journal of Organic Chemistry 8 (March 12, 2012): 379–89. http://dx.doi.org/10.3762/bjoc.8.41.

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Different synthetic routes leading to terpyridines functionalised with furan heterocycles are reviewed. The methodologies used to prepare such compounds include the ring closure of 1,5-diketones and cross-coupling reactions. These versatile terpyridines and their derived metal complexes find applications in various fields including coordination chemistry, medicinal chemistry and material sciences.

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Gómez-Paz, Olaya, Rosa Carballo, Ana Belén Lago, and Ezequiel M. Vázquez-López. "Metallosupramolecular Compounds Based on Copper(II/I) Chloride and Two Bis-Tetrazole Organosulfur Ligands." Chemistry 2, no. 1 (February 4, 2020): 33–49. http://dx.doi.org/10.3390/chemistry2010005.

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The present work assesses the ability of two flexible bis-tetrazole organosulfur ligands to build up different metallosupramolecular compounds based on the analysis of the different supramolecular interactions. The reaction of copper(II) chloride dihydrate with the N,N’-donor dithioether ligands bis(1-methyl-1H-tetrazole-5-ylthio)methane (BMTTM) and 1,2-bis(1-methyl-1H-tetrazole-5-ylthio)ethane (BMTTE) was investigated using different synthetic methods. Four compounds have been obtained as single crystals: two pseudopolymorphic 1D Cu(II) coordination polymers with the ligand BMTTM, a 2D Cu(II) coordination polymer and a discrete Cu(I) tetramer with the BMTTE ligand. The effects of the weak interactions on the crystal packing and the Hirshfeld surfaces of the structures were analyzed to clarify the nature of the intermolecular interactions.

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Dembinski, Roman, Renata Kaczmarek, Dariusz Korczyński, and Karolina Królewska-Golińska. "Organometallic Nucleosides: Synthesis and Biological Evaluation of Substituted Dicobalt Hexacarbonyl Alkynyl Modified 2′-Deoxyuridines." Proceedings 22, no. 1 (August 12, 2019): 62. http://dx.doi.org/10.3390/proceedings2019022062.

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In continuation of synthetic pursuit of metallo-nucleosides, in particular dicobalt hexacarbonyl 5-alkynyl-2′-deoxyuridines, novel compounds with alkynyl groups were synthesized, starting from 5-iodo-2′-deoxyuridine. Reactions of dicobalt octacarbonyl [Co2(CO)8] with 2′-deoxy-5-oxopropynyluridines and related compounds gave dicobalt hexacarbonyl nucleoside complexes (83–31%). The growth inhibition of HeLa and K562 cancer cell lines by organometallic nucleosides was examined and compared to that by alkynyl nucleoside precursors. Coordination of the dicobalt carbonyl moiety to the 2′-deoxy-5-alkynyluridines led to a significant increase in its cytotoxic potency. The cobalt compounds antiproliferative activities against the HeLa cell line and the K562 cell line will be described. Coordination of an acetyl-substituted cobalt nucleoside was expanded using the 1,1-bis(diphenylphosphino)methane (dppm) ligand, resulting in cytotoxicity at comparable levels. The formation of reactive oxygen species in the presence of cobalt compounds was determined in K562 cells. The results indicate that the mechanism of action for most antiproliferative cobalt compounds may be related to the induction of oxidative stress.

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Schulz, Jiří, Zdeněk Leitner, Ivana Císařová, and Petr Štěpnička. "Synthesis and Coordination Behavior of a Flexible Bis(phosphinoferrocene) Ligand." Molecules 23, no. 8 (August 16, 2018): 2054. http://dx.doi.org/10.3390/molecules23082054.

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A symmetrical flexible bis(phosphinoferrocene) derivative, viz. bis[1′-(diphenylphosphino)ferrocenyl]methane (1), was prepared and studied as a ligand in Pd(II) and Au(I) complexes. The reactions of 1 with [PdCl2(cod)] (cod = cycloocta-1,5-diene) and [Pd(μ-Cl)(LNC)]2 (LNC = [2-(dimethylamino-κN)methyl]phenyl-κC1) produced bis(phosphine) complex trans-[PdCl2(1-κ2P,P′)] (4), wherein the ligand spans trans positions in the square-planar coordination sphere of Pd(II) and the tetranuclear, P,P-bridged complex [(μ(P,P′)-1){PdCl(LNC)}2] (5), respectively. In reactions with the Au(I) precursors [AuCl(tht)] and [Au(tht)2][SbF6] (tht = tetrahydrothiophene), ligand 1 gave rise to tetranuclear Au2Fe2 complex [(μ(P,P′)-1)(AuCl)2] (6) and to symmetrical macrocyclic tetramer [Au4(μ(P,P′)-1)4][SbF6]4 (7). All compounds were characterized by spectroscopic methods. In addition, the structures of compound 1, its synthetic precursor bis[1′-(diphenylphosphino)ferrocenyl]methanone (3), and all aforementioned Pd(II) and Au(I) complexes were determined by single-crystal X-ray diffraction analysis (some in solvated form).

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Boeckmann, Jan, Nils Evers, and Christian Näther. "New nickel(ii) thiocyanato coordination compounds: synthetic aspects, polymorphism, thermal reactivity and magnetic properties." CrystEngComm 14, no. 3 (2012): 1094–104. http://dx.doi.org/10.1039/c1ce06011b.

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Mocanu, Teodora, Nataliya Plyuta, Thomas Cauchy, Marius Andruh, and Narcis Avarvari. "Dimensionality Control in Crystalline Zinc(II) and Silver(I) Complexes with Ditopic Benzothiadiazole-Dipyridine Ligands." Chemistry 3, no. 1 (February 12, 2021): 269–87. http://dx.doi.org/10.3390/chemistry3010020.

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Three 2,1,3-benzothiadiazole-based ligands decorated with two pyridyl groups, 4,7-di(2-pyridyl)-2,1,3-benzothiadiazol (2-PyBTD), 4,7-di(3-pyridyl)-2,1,3-benzothiadiazol (3-PyBTD) and 4,7-di(4-pyridyl)-2,1,3 benzothiadiazol (4-PyBTD), generate ZnII and AgI complexes with a rich structural variety: [Zn(hfac)2(2-PyBTD)] 1, [Zn2(hfac)4(2-PyBTD)] 2, [Ag(CF3SO3)(2-PyBTD)]23, [Ag(2-PyBTD)]2(SbF6)24, [Ag2(NO3)2(2-PyBTD)(CH3CN)] 5, [Zn(hfac)2(3-PyBTD)] 6, [Zn(hfac)2(4-PyBTD)] 7, [ZnCl2(4-PyBTD)2] 8 and [ZnCl2(4-PyBTD)] 9 (hfac = hexafluoroacetylacetonato). The nature of the resulting complexes (discrete species or coordination polymers) is influenced by the relative position of the pyridyl nitrogen atoms, the nature of the starting metal precursors, as well as by the synthetic conditions. Compounds 1 and 8 are mononuclear and 2, 3 and 4 are binuclear species. Compounds 6, 7 and 9 are 1D coordination polymers, while compound 5 is a 2D coordination polymer, the metal ions being bridged by 2-PyBTD and nitrato ligands. The solid-state architectures are sustained by intermolecular π–π stacking interactions established between the pyridyl group and the benzene ring from the benzothiadiazol moiety. Compounds 1, 2, 7–9 show luminescence in the visible range. Density Functional Theory (DFT) and Time Dependent Density Functional Theory (TD-DFT) calculations have been performed on the ZnII complexes 1 and 2 in order to disclose the nature of the electronic transitions and to have an insight on the modulation of the photophysical properties upon complexation.

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Figueira, Flávio, Andreia S. F. Farinha, Augusto C. Tomé, José A. S. Cavaleiro, Filipe A. Almeida Paz, and João P. C. Tomé. "Synthesis of hexaphyrins and N-fused pentaphyrins bearing pyridin-4-ylsulfanyl groups." Journal of Porphyrins and Phthalocyanines 18, no. 08n09 (August 2014): 824–31. http://dx.doi.org/10.1142/s1088424614500606.

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In recent years much attention has been devoted to expanded macrocyclic chemistry. Nevertheless, while several advancements were achieved in the synthesis of novel expanded porphyrin architectures, not much has been developed in the functionalization of these macrocycles. This report shows the selective replacement of the p-fluorine atoms of meso-pentakis(pentafluorophenyl) N-fused [22]pentaphyrin and meso-hexakis(pentafluorophenyl) [26]hexaphyrin with 4-mercaptopyridine moieties, thus increasing their potential as ligands for coordination chemistry and catalysis or electronic transfer applications striving new synthetic methodologies and a new set of specific applications for this type of compounds.

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Gutiérrez, M. Susana, Kenia A. López, Jeroni Morey, and M. Nieves Piña. "Introducing Selectivity on Carbonaceous Material: Removing Noble Salts, Au3+, and Ag+ from Aqueous Media by Nanodiamonds Functionalized with Squaramides." Materials 13, no. 5 (February 29, 2020): 1086. http://dx.doi.org/10.3390/ma13051086.

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Nanodiamonds coated with dopamine−squaramide compounds have been prepared by a calcination/esterification synthetic process, which improves the efficiency of this carbonaceous material with respect to non-functionalized nanodiamonds. The modified nanodiamonds show excellent selective coordination of Ag+ and Au3+ cations in a Cd2+, Co2+, Cr3+, Cu2+, Pb2+, and Zn2+ mixture in water. The coordination capacity of the carbonyl squaramide groups with the silver and gold cation is based on purely electrostatic cation−dipole interactions. Overall, it is demonstrated that the conjunction between the nanodiamonds and the organic receptor improves the selectivity of the material toward noble cations.

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Siidra, Oleg I., Evgeny V. Nazarchuk, Dmitry O. Charkin, Nikita V. Chukanov, Alexander Yu Zakharov, Stepan N. Kalmykov, Yuriy A. Ikhalaynen, and Mikhail I. Sharikov. "Open-framework sodium uranyl selenate and sodium uranyl sulfate with protonated morpholino-N-acetic acid." Zeitschrift für Kristallographie - Crystalline Materials 234, no. 2 (February 25, 2019): 109–18. http://dx.doi.org/10.1515/zkri-2018-2103.

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Abstract The reaction of sodium N-morpholine acetate with selenic and sulfuric acid and uranyl nitrate results in the formation of two novel open-framework compounds, |Na(Hmfa)|[(UO2)2(SeO4)3(H2O)](H2O)2 (NaUSe) and [Na2(SO3OH)(Hmfa)]|(UO2)(SO4)2| (NaUS), respectively. Despite identical synthetic procedures, sulfate structure dramatically differs from selenate compound. Their common feature is an open-framework featuring two-dimensional system of channels occupied by protonated morpholino-N-acetic acid species. Coordination of Na atoms is different. In NaUSe, [(UO2)2 (SeO4)3(H2O)]2− layers are pillared by {Na2O8(H2O)2(Hmfa)2} complexes to form a microporous framework. In NaUS, UO7 and SO4 polyhedra of [(UO2)(SO4)2]2− chains share common oxygen atoms with Na-centered tetrameric complexes providing a three-dimensional integrity of the structure. Both of the compounds are characterized by IR spectroscopy.

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Černý, Radovan, Matteo Brighi, and Fabrizio Murgia. "The Crystal Chemistry of Inorganic Hydroborates." Chemistry 2, no. 4 (September 29, 2020): 805–26. http://dx.doi.org/10.3390/chemistry2040053.

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The crystal structures of inorganic hydroborates (salts and coordination compounds with anions containing hydrogen bonded to boron) except for the simplest anion, borohydride BH4−, are analyzed regarding their structural prototypes found in the inorganic databases such as Pearson’s Crystal Data [Villars and Cenzual (2015), Pearson’s Crystal Data. Crystal Structure Database for Inorganic Compounds, Release 2019/2020, ASM International, Materials Park, Ohio, USA]. Only the compounds with hydroborate as the only type of anion are reviewed, although including compounds gathering more than one different hydroborate (mixed anion). Carbaborane anions and partly halogenated hydroborates are included. Hydroborates containing anions other than hydroborate or neutral molecules such as NH3 are not discussed. The coordination polyhedra around the cations, including complex cations, and the hydroborate anions are determined and constitute the basis of the structural systematics underlying hydroborates chemistry in various variants of anionic packing. The latter is determined from anion–anion coordination with the help of topology analysis using the program TOPOS [Blatov (2006), IUCr CompComm. Newsl. 7, 4–38]. The Pauling rules for ionic crystals apply only to smaller cations with the observed coordination number within 2–4. For bigger cations, the predictive power of the first Pauling rule is very poor. All non-molecular hydroborate crystal structures can be derived by simple deformation of the close-packed anionic lattices, i.e., cubic close packing (ccp) and hexagonal close packing (hcp), or body-centered cubic (bcc), by filling tetrahedral or octahedral sites. This review on the crystal chemistry of hydroborates is a contribution that should serve as a roadmap for materials engineers to design new materials, synthetic chemists in their search for promising compounds to be prepared, and materials scientists in understanding the properties of novel materials.

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Sorenson, Shayne, Marina Popova, Atta M. Arif, and Lisa M. Berreau. "A bipyridine-ligated zinc(II) complex with bridging flavonolate ligation: synthesis, characterization, and visible-light-induced CO release reactivity." Acta Crystallographica Section C Structural Chemistry 73, no. 9 (August 14, 2017): 703–9. http://dx.doi.org/10.1107/s2053229617011366.

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Metal–flavonolate compounds are of significant current interest as synthetic models for quercetinase enzymes and as bioactive compounds of importance to human health. Zinc–3-hydroxyflavonolate compounds, including those of quercetin, kampferol, and morin, generally exhibit bidentate coordination to a single ZnII center. The bipyridine-ligated zinc–flavonolate compound reported herein, namely bis(μ-4-oxo-2-phenyl-4H-chromen-3-olato)-κ3 O 3:O 3,O 4;κ3 O 3,O 4:O 3-bis[(2,2′-bipyridine-κ2 N,N′)zinc(II)] bis(perchlorate), {[Zn2(C15H9O3)2(C10H8N2)2](ClO4)2} n , (1), provides an unusual example of bridging 3-hydroxyflavonolate ligation in a dinuclear metal complex. The symmetry-related ZnII centers of (1) exhibit a distorted octahedral geometry, with weak coordination of a perchlorate anion trans to the bridging deprotonated O atom of the flavonolate ligand. Variable-concentration conductivity measurements provide evidence that, when (1) is dissolved in CH3CN, the complex dissociates into monomers. 1H NMR resonances for (1) dissolved in d 6-DMSO were assigned via HMQC to the H atoms of the flavonolate and bipyridine ligands. In CH3CN, (1) undergoes quantitative visible-light-induced CO release with a quantum yield [0.004 (1)] similar to that exhibited by other mononuclear zinc–3-hydroxyflavonolate complexes. Mass spectroscopic identification of the [(bpy)2Zn(O-benzoylsalicylate)]+ ion provides evidence of CO release from the flavonol and of ligand exchange at the ZnII center.

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Loukopoulos, Edward, Benjamin Berkoff, Kieran Griffiths, Victoria Keeble, Vassiliki N. Dokorou, Athanassios C. Tsipis, Albert Escuer, and George E. Kostakis. "Cobalt(ii/iii), nickel(ii) and copper(ii) coordination clusters employing a monoanionic Schiff base ligand: synthetic, topological and computational mechanistic aspects." CrystEngComm 17, no. 35 (2015): 6753–64. http://dx.doi.org/10.1039/c5ce01294e.

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Nine coordination clusters (M = Co^II/III, Ni^II, Cu^II) using a monoanionic Schiff base ligand were synthesized and characterized. A series of transformations occur in the ligand in certain compounds.

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Novikov, Roman A., and Yury V. Tomilov. "Application of Complexes of Group 13 Elements in Synthetic Organic Chemistry for Activation of Carbonyl Compounds." Vestnik RFFI, no. 2 (June 25, 2019): 113–40. http://dx.doi.org/10.22204/2410-4639-2019-102-02-113-140.

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The main aspects of modern organic chemistry of the Group 13 elements – aluminum (Al), gallium (Ga), indium (In), and thallium (Tl) – are considered. Herewith, the main emphasis is placed on their use for the various carbonyl compounds activation in organic synthesis and reactions, which are specific for these elements. The 21th century marked a new era in the development of chemistry of the Group 13 elements; it is connected with the discovery of surprising and unexpected reactions and new compounds (primarily in the area of organic and coordination chemistry), defining various fields of these elements application.

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38

Hu, Thomas Q., and Larry Weller. "Design and synthesis of analogues of ionomycin." Canadian Journal of Chemistry 72, no. 6 (June 1, 1994): 1500–1511. http://dx.doi.org/10.1139/v94-187.

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Based on the analysis of the crystal structure of the Ca2+ salt of ionomycin and the chemical and physical data on ionomycin, a number of ionomycin analogues have been synthesized to study the structural features affecting the Ca2+ binding and transport. Compounds 2, 3, and 4 were synthesized to study the effect of additional intramolecular oxygen coordination sites on Ca2+ transport. Compounds 5a–5d were prepared to study the effect of lipid solubility on Ca2+ binding and transport. Compounds 6a–6c were prepared to study the effect of the distance between the β-diketone and the carboxyl group on Ca2+ transport. A general synthetic route to these compounds has been developed. The key reactions in this route are the consecutive regioselective alkylations of the dianion of 2,4-pentanedione with the appropriate bromides.[Formula: see text]

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39

Patron, Luminita, Oana Carp, Ioana Mindru, Gabriela Marinescu, Nicolae Stanica, and Ioan Balint. "Polynuclear coordination precursors compounds for M3Fe5O12 garnets (M=Y, Eu, Gd and Er), Part I: Synthesis of the precursors." Journal of the Serbian Chemical Society 70, no. 8-9 (2005): 1049–56. http://dx.doi.org/10.2298/jsc0509049p.

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Anew type of complexes compounds (NH4)6[M3Fe5(C4O5H4)6(C4O5H3)6]. 16H2O (where M(III) = Y, Eu, Gd, Er), (NH4)6[M3Fe5(C4O6H4)6(C4O6H3)6]. 16H2O (where M(III) = Gd, Er) and (NH4)6[M3Fe5(C6O7H10)6(C6O7H9)6]. xH2O (where M(III) = Y; x = 8; M(III) = Eu, Er; x = 22) [C4O5H4 2? = malate anion C4O6H42? = tartarate anion, C6O7H11 ? = gluconate anion_ have been synthesized and characterised by elemental chemical analysis and physico-chemical measurements (IR, UV-Vis spectroscopy and magnetic determinations). The synthetic possibilities offered by the use of these new compounds as potential precursors for garnets have been suggested.

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Kustova, Tatyana V., Elena A. Rogova, and Alexander M. Sinitsyn. "SYNTHESIS OF GALLIUM COMPLEXES OF TERT-BUTYLSUBSTITUTED ACYCLIC AND CYCLIC COMPOUNDS BASED ON 3,5-DIAMINO-1,2,4-TRIAZOLE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 5 (April 14, 2020): 45–50. http://dx.doi.org/10.6060/ivkkt.20206305.6219.

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Synthetic methods of organic chemistry which are currently available in scientific literature allow obtaining a large number macroheterocycles with structurally different internal coordination cavities. They also provide a number of convenient ways to attach to a macrocyclic platform various biologically active heterocyclic fragments such as guanazol. This paper discusses the synthesis and composition of gallium complexes of cyclic and acyclic compounds based on 3,5-diamino-1H-1,2,4-triazol (guanazol), which is itself widely used in medical practice and, most importantly, for the treatment of cancer, in particular, breast cancer ("Anastrozole", "Letrozole"). Interest in gallium compounds is associated with the discovery of a high tropicity of this element to the DNA of tumor cells, as well as cells of the reticuloendothelial system (macrophages and lymphocytes). Therefore, the synthesis of new potential drugs with gallium salts for tumor chemotherapy is an urgent task. The gallium complex of a macroheterocyclic compound of symmetrical structure based on guanazole was obtained through the formation of a three-unit product - 3,5-bis - (5 (6)-tert-butyl-3-iminoisoindoline-1-ilidenamino)-1,2,4-triazole and its complex, followed by cyclization of 3,5-diamino-1H-1,2,4-triazole in phenol. The structure of the obtained compounds was proved using modern physicochemical research methods (UV, IR, NMR spectroscopy, mass spectrometry, and elemental analysis). In the mass spectra of the obtained compounds there are peaks of molecular ions of the target products and their fragmentation products. The coincidence of the m/z values with the mass of molecular ions, as well as the characteristic distributions of molecular ions with the calculated values, confirms the composition of the synthesized gallium complexes.

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Adeleke, Adesola A., Sizwe J. Zamisa, and Bernard Omondi. "Ag(I) Complexes of Imine Derivatives of Unexpected 2-Thiophenemethylamine Homo-Coupling and Bis-(E)-N-(furan-2-ylmethyl)-1-(quinolin-2-yl)methanimine." Molbank 2021, no. 2 (June 12, 2021): M1235. http://dx.doi.org/10.3390/m1235.

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Imines are fundamental organic compounds used as synthetic intermediates and as ligands in coordination chemistry. They are also found to be important pharmacophores in various bioactive compounds. In this report, two Schiff bases were prepared using the traditional condensation of 4-pyridinecarboxaldehyde with 2-thiophenemethylamine and 2-quinolinecarboxaldehyde with furfurylamine to form (E)-1-(pyridin-4-yl)-N-(thiophen-2-ylmethyl)methanimine (L1) and (E)-N-(furan-2-ylmethyl)-1-(quinolin-2-yl)methanimine (L2) respectively. L1 and L2 were complexed with silver perchlorate in 2:1 [M:L] stoichiometry to obtain complexes 1 and 2, respectively. The crystal structures of 1 and 2 were unequivocally determined by single-crystal X-ray diffraction analysis. The resulting structures revealed 2 to be a four-coordinate as expected. In contrast, an unexpected chemoselective hydrolytic cleavage of one mole of the (CH=N) imine ligands occurred in complex 2 and, further, the amines (thiophenemethylamine) homo-coupled to form a new imine ligand derivative in situ (L1a) before coordinating to the Ag(I) center along with L1. This observation described an alternative synthetic route to be explored to synthesize a diverse range of imine derivatives, which involves the Ag(I)-promoted homo-coupling of amines. Herein, the crystal structures of Ag(I) complexes of pyridinyl [Ag(L1)(L1a)]ClO4 (1) and quinolinyl [Ag(L2)2]ClO4 (2) Schiff bases are presented.

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Velo-Gala, Inmaculada, Miquel Barceló-Oliver, Diego M. Gil, Josefa M. González-Pérez, Alfonso Castiñeiras, and Alicia Domínguez-Martín. "Deciphering the H-Bonding Preference on Nucleoside Molecular Recognition through Model Copper(II) Compounds." Pharmaceuticals 14, no. 3 (March 9, 2021): 244. http://dx.doi.org/10.3390/ph14030244.

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The synthetic nucleoside acyclovir is considered an outstanding model of the natural nucleoside guanosine. With the purpose of deepening on the influence and nature of non-covalent interactions regarding molecular recognition patterns, three novel Cu(II) complexes, involving acyclovir (acv) and the ligand receptor N-(2-hydroxyethyl)ethylenediamine (hen), have been synthesized and thoroughly characterized. The three novel compounds introduce none, one or two acyclovir molecules, respectively. Molecular recognition has been evaluated using single crystal X-ray diffraction. Furthermore, theoretical calculations and other physical methods such as thermogravimetric analysis, infrared and UV-Vis spectroscopy, electron paramagnetic resonance and magnetic measurements have been used. Theoretical calculations are in line with experimental results, supporting the relevance of the [metal-N7(acv) + H-bond] molecular recognition pattern. It was also shown that (hen)O-H group is used as preferred H-donor when it is found within the basal coordination plane, since the higher polarity of the terminal (hen)O-H versus the N-H group favours its implication. Otherwise, when (hen)O-H occupies the distal coordination site, (hen)N-H groups can take over.

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Vecchi, Andrea, Pierluca Galloni, Barbara Floris, and Victor N. Nemykin. "New developments in chemistry of organometallic porphyrins and their analogs." Journal of Porphyrins and Phthalocyanines 17, no. 03 (March 2013): 165–96. http://dx.doi.org/10.1142/s1088424613300012.

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In this mini-review, new developments in chemistry of organometallic porphyrins and their analogs reported between 2007 and mid 2012 have been discussed. Synthetic strategies for preparation, as well as properties of metallocenyl-type compounds in which organometallic substituents connected to the porphyrinoid via (i) axial coordination; (ii) covalent bond to meso- or β-pyrrolic position; or (iii) β,β′-fused into the aromatic system as well as porphyrinoids with organometallic fragments σ-bonded in η1-fashion were overviewed.

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Garg, R., N. Fahmi, and R. V. Singh. "Synthetic, spectral, and antimicrobial aspects of biologically relevant coordination compounds of dioxomolybdenum(VI) and oxovanadium(V)." Russian Journal of Coordination Chemistry 34, no. 3 (March 2008): 198–203. http://dx.doi.org/10.1134/s1070328408030093.

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Pethe, G. B., A. R. Yaul, and A. S. Aswar. "Synthetic, characterization and catalytic studies of some coordination compounds derived from unsymmetrical quadridentate Schiff base ligand." Russian Journal of General Chemistry 81, no. 11 (November 2011): 2304–9. http://dx.doi.org/10.1134/s1070363211110144.

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Hanifehpour, Younes, Jaber Dadashi, and Babak Mirtamizdoust. "Ultrasound-Assisted Synthesis and Crystal Structure of Novel 2D Cd (II) Metal–Organic Coordination Polymer with Nitrite End Stop Ligand as a Precursor for Preparation of CdO Nanoparticles." Crystals 11, no. 2 (February 17, 2021): 197. http://dx.doi.org/10.3390/cryst11020197.

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In the present research, a sonochemical approach was applied to prepare new cadmium(II) coordination 2D polymer, [Cd(L)(NO2)2]n (L = 1,2-bis(1-(pyridin-3-yl)ethylidene)hydrazine) and structurally characterized with various spectroscopic techniques including XRD, elemental analysis, SEM, and IR spectroscopy. The coordination number of cadmium (II) ions is seven (CdN2O5) by two nitrogen atoms from two organic Schiff base ligand and five oxygen of nitrite anions. The 2D sheet structures ended by nitrite anions and the nitrite anion displayed the end-stop role. The comprehensive system showed a three-dimensional structure with several weak interactions. The high-intensity ultrasound is regarded as an easy, environmentally-friendly, and flexible synthetic instrument for the compounds of coordination. CdO NPs was obtained by thermolysing 1 at 180 °C with oleic acid (as a surfactant). Further, the size and morphology of the produced CdO nanoparticles were investigated through SEM.

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Ojelere, Olusola, David Graf, and Sanjay Mathur. "Molecularly Engineered Lithium–Chromium Alkoxide for Selective Synthesis of LiCrO2 and Li2CrO4 Nanomaterials." Inorganics 7, no. 2 (February 14, 2019): 22. http://dx.doi.org/10.3390/inorganics7020022.

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Achieving control over the phase-selective synthesis of mixed metal oxide materials remains a challenge to the synthetic chemist due to diffusion-driven growth, which necessitates the search for new compounds with pre-existent chemical bonds between the phase-forming elements. We report here a simple solvothermal process to fabricate LiCrO2 and Li2CrO4 nanoparticles from bimetallic single-source precursors, demonstrating the distinctive influence of molecular design and calcination conditions on the resulting nanomaterials. The chemical identity of [Li2Cr(OtBu)4Cl(THF)2] (1) and [LiCr(OtBu)2(PyCH=COCF3)2(THF)2] (2) was unambiguously established in the solid state by single-crystal X-ray diffraction, revealing the formation of a coordination polymeric chain in compound 1, whereas electron paramagnetic resonance spectroscopy (EPR) studies revealed a monomeric structure in solution. TEM analysis of synthesized LiCrO2 nanoparticles showed nearly uniform particles size of approximately 20 nm. The sensitivity of the LiCrO2 phase towards oxidation was investigated by X-ray diffraction, revealing the formation of the stable Li2CrO4 after calcination in air.

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Resines-Urien, Esther, Lucía Piñeiro-López, Estefania Fernandez-Bartolome, Arturo Gamonal, Mar Garcia-Hernandez, and José Sánchez Costa. "Covalent post-synthetic modification of switchable iron-based coordination polymers by volatile organic compounds: a versatile strategy for selective sensor development." Dalton Transactions 49, no. 22 (2020): 7315–18. http://dx.doi.org/10.1039/d0dt01533d.

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Stinghen, Danilo, André Luis Rüdiger, Siddhartha O. K. Giese, Giovana G. Nunes, Jaísa F. Soares, and David L. Hughes. "Cobalt(II) chloride adducts with acetonitrile, propan-2-ol and tetrahydrofuran: considerations on nuclearity, reactivity and synthetic applications." Acta Crystallographica Section C Structural Chemistry 73, no. 2 (January 24, 2017): 104–14. http://dx.doi.org/10.1107/s2053229617000705.

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High-spin cobalt(II) complexes are considered useful building blocks for the synthesis of single-molecule magnets (SMM) because of their intrinsic magnetic anisotropy. In this work, three new cobalt(II) chloride adducts with labile ligands have been synthesized from anhydrous CoCl2, to be subsequently employed as starting materials for heterobimetallic compounds. The products were characterized by elemental, spectroscopic (EPR and FT–IR) and single-crystal X-ray diffraction analyses.trans-Tetrakis(acetonitrile-κN)bis(tetrahydrofuran-κO)cobalt(II) bis[(acetonitrile-κN)trichloridocobaltate(II)], [Co(C2H3N)4(C4H8O)2][CoCl3(C2H3N)]2, (1), comprises mononuclear ions and contains both acetonitrile and tetrahydrofuran (thf) ligands, The coordination polymercatena-poly[[tetrakis(propan-2-ol-κO)cobalt(II)]-μ-chlorido-[dichloridocobalt(II)]-μ-chlorido], [Co2Cl4(C3H8O)4], (2′), was prepared by direct reaction between anhydrous CoCl2and propan-2-ol in an attempt to rationalize the formation of the CoCl2–alcohol adduct (2), probably CoCl2(HOiPr)m. The binuclear complex di-μ-chlorido-1:2κ4Cl:Cl-dichlorido-2κ2Cl-tetrakis(tetrahydrofuran-1κO)dicobalt(II), [Co2Cl4(C4H8O)4], (3), was obtained from (2) after recrystallization from tetrahydrofuran. All three products present cobalt(II) centres in both octahedral and tetrahedral environments, the former usually less distorted than the latter, regardless of the nature of the neutral ligand. Product (2′) is stabilized by an intramolecular hydrogen-bond network that appears to favour atransarrangement of the chloride ligands in the octahedral moiety; this differs from thecisdisposition found in (3). The expected easy displacement of the bound solvent molecules from the metal coordination sphere makes the three compounds good candidates for suitable starting materials in a number of synthetic applications.

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Pakulski, Paweł, and Dawid Pinkowicz. "1,2,5-Thiadiazole 1,1-dioxides and Their Radical Anions: Structure, Properties, Reactivity, and Potential Use in the Construction of Functional Molecular Materials." Molecules 26, no. 16 (August 11, 2021): 4873. http://dx.doi.org/10.3390/molecules26164873.

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This work provides a summary of the preparation, structure, reactivity, physicochemical properties, and main uses of 1,2,5-thiadiazole 1,1-dioxides in chemistry and material sciences. An overview of all currently known structures containing the 1,2,5-thiadiazole 1,1-dioxide motif (including the anions radical species) is provided according to the Cambridge Structural Database search. The analysis of the bond lengths typical for neutral and anion radical species is performed, providing a useful tool for unambiguous assessment of the valence state of the dioxothiadiazole-based compounds based solely on the structural data. Theoretical methodologies used in the literature to describe the dioxothiadiazoles are also shortly discussed, together with the typical ‘fingerprint’ of the dioxothiadiazole ring reported by means of various spectroscopic techniques (NMR, IR, UV-Vis). The second part describes the synthetic strategies leading to 1,2,5-thiadiazole 1,1-dioxides followed by the discussion of their electrochemistry and reactivity including mainly the chemical methods for the successful reduction of dioxothiadiazoles to their anion radical forms and the ability to form coordination compounds. Finally, the magnetic properties of dioxothiadiazole radical anions and the metal complexes involving dioxothiadiazoles as ligands are discussed, including simple alkali metal salts and d-block coordination compounds. The last section is a prospect of other uses of dioxothiadiazole-containing molecules reported in the literature followed by the perspectives and possible future research directions involving these compounds.

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Journal articles on the topic 'Coordination compounds (Synthetic)'

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