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Artykuły w czasopismach na temat „Polynuclear Coordination Complexes”

Autor: Grafiati

Data publikacji: 7 września 2023

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1

Bonanno, Nico M., Alan J. Lough i Martin T. Lemaire. "Polynuclear Cu4L4 Copper(II) Aminyl Radical Coordination Complexes". Inorganic Chemistry 57, nr 9 (25.04.2018): 4837–40. http://dx.doi.org/10.1021/acs.inorgchem.8b00785.

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2

Abad Galán, Laura, Alexandre N. Sobolev, Eli Zysman-Colman, Mark I. Ogden i Massimiliano Massi. "Lanthanoid complexes supported by retro-Claisen condensation products of β-triketonates". Dalton Transactions 47, nr 48 (2018): 17469–78. http://dx.doi.org/10.1039/c8dt03585g.

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3

Hasegawa, Yasuchika, i Yuichi Kitagawa. "Thermo-sensitive luminescence of lanthanide complexes, clusters, coordination polymers and metal–organic frameworks with organic photosensitizers". Journal of Materials Chemistry C 7, nr 25 (2019): 7494–511. http://dx.doi.org/10.1039/c9tc00607a.

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Historical and recent advances of lanthanide mononuclear complexes, polynuclear clusters, coordination polymers (CPs) and metal–organic frameworks (MOFs) with temperature-dependent luminescence are reviewed for future thermo-sensitive paints.

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4

Fleischmann, Martin, Luis Dütsch, Mehdi Elsayed Moussa, Andrea Schindler, Gábor Balázs, Christophe Lescop i Manfred Scheer. "Organometallic polyphosphorus and -arsenic ligands as linkers between pre-assembled linear CuI fragments". Chemical Communications 51, nr 14 (2015): 2893–95. http://dx.doi.org/10.1039/c4cc09845e.

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We present a simple route to multimetallic Cu^I building blocks and their interaction with organometallic polyphosphorus and -arsenic linkers affording in novel polynuclear complexes or one-dimensional coordination polymers.

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5

Ang, Joo Chuan, Yanyan Mulyana, Chris Ritchie, Rodolphe Clérac i Colette Boskovic. "Mixed-Valent Polynuclear Cobalt Complexes Incorporating Tetradentate Phenoxyamine Ligands". Australian Journal of Chemistry 62, nr 9 (2009): 1124. http://dx.doi.org/10.1071/ch09256.

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The new potentially tetradentate ligand precursor 2-[(bis(2-hydroxyethyl)amino)methyl]-4,6-bis-tert-butylphenol (H3L) has been synthesized and characterized. The reaction of H3L with cobalt(ii) acetate has afforded the novel mixed-valent tetra- and pentanuclear cobalt complexes [CoII2CoIII2(OAc)2(L)2(HL)] (1) and [CoIICoIII4(OAc)2(L)4] (2). Single-crystal X-ray diffraction studies of these complexes indicate different coordination geometries for the divalent cobalt centres in each complex, with distorted trigonal bipyramidal and distorted tetrahedral coordination evident in 1 and 2, respectively. The variable temperature magnetic susceptibility data for complex 1 reveal behaviour dominated by antiferromagnetic coupling between the two cobalt(ii) centres. Their approximate trigonal bipyramidal coordination geometries give rise to a 4A′2 ground term, allowing a spin-only treatment assuming local spin quantum numbers of Si = 3/2. Fitting the data to the Heisenberg exchange Hamiltonian (Ĥex = –2JS·1S2) results in J = –6.9(1) cm–1 and g = 2.30(5).

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6

Aguilà, David, Olivier Roubeau i Guillem Aromí. "Designed polynuclear lanthanide complexes for quantum information processing". Dalton Transactions 50, nr 35 (2021): 12045–57. http://dx.doi.org/10.1039/d1dt01862k.

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The design of dissymmetric organic ligands has been exploited to produce heterometallic dinuclear and trinuclear lanthanide-based coordination compounds with the requirements to act as logical quantum gates for spin-based quantum computing.

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7

Thompson, L. "Polynuclear coordination complexes—from dinuclear to nonanuclear and beyond". Coordination Chemistry Reviews 233-234 (1.11.2002): 193–206. http://dx.doi.org/10.1016/s0010-8545(02)00101-7.

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8

Thompson, Laurence K. "2004 Alcan Award LectureFrom dinuclear to triakontahexanuclear complexes Adventures in supramolecular coordination chemistry". Canadian Journal of Chemistry 83, nr 2 (1.02.2005): 77–92. http://dx.doi.org/10.1139/v04-173.

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Polynuclear coordination complexes result from the interplay between the arrangement of the binding sites of a ligand, and their donor content, and the coordination preferences of the metal ion involved. Rational control of the ligand properties, such as denticity, geometry, and size, can lead to large, and sometimes predictable, polynuclear assemblies. This Alcan Award Lecture highlights our "adventures" with polynucleating ligands over the last 25 years, with examples ranging from simple dinucleating to more exotic high-denticity ligands. Complexes with nuclearities ranging from 2 to 36 have been produced, many of which have novel magnetic, electrochemical, and spectroscopic properties. Self-assembly strategies using relatively simple "polytopic" ligands have been very successful in producing high-nuclearity clusters in high yield. For example, linear "tritopic" ligands produce M9 (M = Mn(II), Fe(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II)) [3 × 3], flat grid-like molecules, which have quantum dot-like arrays of nine closely spaced metal centers in electronic communication. Some of these grids are discussed in terms of their novel magnetic and electrochemical properties, and also as multistable nanometer-scale platforms for potential molecular device behaviour. Bigger ligands with extended arrays of coordination pockets, and the capacity to self-assemble into much larger grids, are highlighted to illustrate our current and longer term goals of generating polymetallic molecular two-dimensional layers on surfaces.Key words: Alcan Award Lecture, transition metal, polynuclear, structure, magnetism, electrochemistry, surface studies, molecular device.

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9

Salishcheva, Olesya, i Alexander Prosekov. "Antimicrobial activity of mono- and polynuclear platinum and palladium complexes". Foods and Raw Materials 8, nr 2 (30.09.2020): 298–311. http://dx.doi.org/10.21603/2308-4057-2020-2-298-311.

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Introduction. Infectious diseases remain a serious threat to humanity worldwide as bacterial pathogens grow more diverse. Bacteria, fungi, and parasites develop resistance to clinically approved antimicrobials, which reduces the efficacy of available drugs and treatment measures. As a result, there is an ever growing demand for new highly effective pharmaceuticals. This review describes mono- and polynuclear platinum and palladium complexes with antimicrobial properties. We compared several groups of antibacterial agents: antibiotics, antioxidant biologically active substances, antimicrobial nanoparticles, nanocomposite materials, biopolymers, micellar systems, and plant extracts. Study objects and methods. The review covered relevant articles published in Web of Science, Scopus, and Russian Science Citation Index for the last decade. The list of descriptors included such terms as mononuclear and binuclear complexes of platinum, palladium, and antimicrobial activity. Results and discussion. Chelates of platinum, palladium, silver, iridium, rhodium, ruthenium, cobalt, and nickel are popular therapeutic agents. Their antimicrobial activity against pathogenic microorganisms can be enhanced by increasing their bioavailability. Metalbased drugs facilitate the transport of organic ligands towards the bacterial cell. The nature of the ligand and its coordination change the thermodynamic stability, kinetic lability, and lipophilic properties of the complex, as well as the reactivity of the central atom. Polynuclear platinum and palladium complexes contain two or more bound metal (coordinate) centers. Covalent bonding with bacterial DNA enables them to form a type of DNA adducts, which is completely different from that of mononuclear complexes. Conclusion. Metal-based drugs with functional monodentate ligands exhibit a greater antimicrobial effect compared to free ligands. Poly- and heteronuclear complexes can increase the number of active centers that block the action of bacterial cells. When combined with other antibacterial agents, they provide a synergistic effect, which makes them a promising subject of further research.

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10

Spyratou, Alexandra, Sarah Clifford, Xavier Melich, Claire Deville, Matthieu Tissot, Gregoire Bonvin, Philippe Perrottet i Alan Williams. "Pseudoisotopic Molecule Mass Spectrometry: A Useful Tool for Studying Assembly and Exchange in Multinuclear Complexes". Australian Journal of Chemistry 62, nr 10 (2009): 1291. http://dx.doi.org/10.1071/ch09322.

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Herein, we introduce the concept of pseudoisotope to describe particles which have similar chemistry but different masses. Examples include ligands with different substituents or metal ions with identical charges and similar coordination properties. Mixtures of pseudoisotopes may be used to establish rapidly the nuclearity of polynuclear species by electrospray ionization-mass spectrometry. Pseudoisotope exchange allows the study of the dynamics of polynuclear complexes, and shows these reactions may be surprisingly slow. The evolution of the mass spectra indicates the degree of fragmentation occurring during the exchange.

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11

Sasnovskaya, Valentina D., Leokadiya V. Zorina, Sergey V. Simonov, Artem D. Talantsev, Artem A. Mikhailov, Gennadiy A. Kostin i Eduard B. Yagubskii. "Cyano-bridged polynuclear coordination compounds derived from paramagnetic [Mn(H2daptsc)]2+ and photochromic [Fe(CN)5NO]2− building blocks". CrystEngComm 23, nr 14 (2021): 2733–45. http://dx.doi.org/10.1039/d0ce01863e.

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12

Elorriaga, David, Blanca Parra-Cadenas, Paula Pérez-Ramos, Raquel G. Soengas, Fernando Carrillo-Hermosilla i Humberto Rodríguez-Solla. "Imidazol(in)ium-2-Thiocarboxylate Zwitterion Ligands: Structural Aspects in Coordination Complexes". Crystals 13, nr 9 (26.08.2023): 1304. http://dx.doi.org/10.3390/cryst13091304.

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Azolium-2-thiocarboxylate zwitterion ligands have emerged as a promising class of compounds in the field of coordination chemistry due to their unique structural features and versatile applications. These ligands are characterized by a positively charged azolium ring and a negatively charged thiocarboxylate moiety, making them capable of forming stable coordination complexes with various metal ions. One of the key structural aspects that make these ligands attractive for coordination chemistry is their ability to adopt diverse coordination modes with metal centers. The nature of these ligands enables them to engage in both monodentate and bidentate coordination, resulting in the formation of chelated complexes with enhanced stability and controlled geometry or the formation of polynuclear structures. This versatility in coordination behavior allows for the design of tailored ligands with specific metal-binding preferences, enabling the creation of unique and finely tuned coordination architectures. The azolium-2-thiocarboxylate zwitterionic ligands offer a promising platform for the design of coordination complexes with diverse structural architectures.

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13

Gholizadeh Dogaheh, Samira, Sara Barbero, Joel Barrientos, Jan Janczak, Janet Soleimannejad i E. Carolina Sañudo. "Cathecol and Naphtol Groups in Salphen-Type Schiff Bases for the Preparation of Polynuclear Complexes". International Journal of Molecular Sciences 21, nr 10 (18.05.2020): 3574. http://dx.doi.org/10.3390/ijms21103574.

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In this paper, we show a strategy to modify salphen-type Schiff base ligands with naphtol (SYML1) and pyrocathecol (2,3-dihydroxyphenyl) groups (SYML2), or a combination of both (ASYML). Each of these ligands can be used to obtain polynuclear metal complexes following two different strategies. One relies on using metals that are either too large for the N2O2 cavity or not fond of coordination number 4 and the other one relies on forcing the polynuclear species by adding functional groups to the hydroxybenzaldehayde in order to have extra coordination sites in the ligand. We report and characterize the mononuclear complexes SYML1-Cu and SYML1-Ce, along with the dinuclear complex SYML1-Fe and the tetranuclear species SYML2-Mn. The asymmetric ligand ASYML routinely hydrolyzes into the symmetric ligands in the reaction mixtures. SYML1-Fe displays a nearly linear Fe-O-Fe bridge with very strong antiferromagnetic coupling between the Fe(III) ions.

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14

Nunes, Marcelo Carpes, Marcos Antonio Ribeiro i Fábio Souza Nunes. "New Copper and Oxomolybdate Robson-Type Polynuclear Macrocyclic Complexes: Structure, Spectroscopy, and Electrochemical Properties". Journal of Chemistry 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/506932.

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The polynuclear complexes [Mo3O8(tidf)]·dmso·2H2O (1) and [{Cu2(tidf)}2(μ-Mo8O24)] (2) (tidf2−is a symmetrical tetraiminodiphenolate Robson-type macrocyclic ligand) were prepared from equimolar combinations of [Mg2(tidf)](NO3)2·4H2O, [MoO2Cl2(dmso)2] (for1) and complex1and Cu(ClO4)2·4H2O (for2) in acetonitrile. Molecular structures of both complexes were determined and showed atypical modes of coordination. A significant observation was the remarkable flexibility of the macrocycle ligand that effectively accommodated the steric demands of metal cations and the packing forces and showed a unique mode of coordination. Spectroscopic (UV-vis and FTIR) and redox properties are discussed.

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15

Pascu, Mirela, Marius Andruh, Achim Müller i Marc Schmidtmann. "Binuclear coordination compounds as building-blocks in designing polynuclear complexes". Polyhedron 23, nr 4 (luty 2004): 673–78. http://dx.doi.org/10.1016/j.poly.2003.11.041.

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16

Mahé, N., O. Guillou, C. Daiguebonne, Y. Gérault, A. Caneschi, C. Sangregorio, J. Y. Chane-Ching, P. E. Car i T. Roisnel. "Polynuclear Lanthanide Hydroxo Complexes: New Chemical Precursors for Coordination Polymers". Inorganic Chemistry 44, nr 22 (październik 2005): 7743–50. http://dx.doi.org/10.1021/ic0401086.

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17

Galán Mascarós, Jose Ramón, Guillem Aromí i Mohanad Darawsheh. "Polynuclear Fe(II) complexes: Di/trinuclear molecules and coordination networks". Comptes Rendus Chimie 21, nr 12 (grudzień 2018): 1209–29. http://dx.doi.org/10.1016/j.crci.2018.07.005.

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18

Takada, Kenji, Mari Morita, Takane Imaoka, Junko Kakinuma, Ken Albrecht i Kimihisa Yamamoto. "Metal atom–guided conformational analysis of single polynuclear coordination molecules". Science Advances 7, nr 32 (sierpień 2021): eabd9887. http://dx.doi.org/10.1126/sciadv.abd9887.

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Microscopic observation of single molecules is a rapidly expanding field in chemistry and differs from conventional characterization techniques that require a large number of molecules. One of such form of single-molecule microscopy is high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), which is especially suitable for coordination compounds because of its atomic number–dependent contrast. However, to date, single-molecule observations using HAADF-STEM has limited to simple planar molecules. In the present study, we demonstrate a direct structural investigation of nonplanar dendronized polynuclear Ir complexes with subnanometer resolution using Ir as an atomic label. Decreasing the electron dose to the dendrimer complexes is critical for the single-molecule observation. A comparison with simulated STEM images of conformational isomers is performed to determine the most plausible conformation. Our results enlarge the potential of electron microscopic observation to realize structural analysis of coordination macromolecules, which has been impossible with conventional methods.

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19

Gusev, Alexey N., Ivan Nemec, Radovan Herchel, Eziz Bayjyyev, Galyna A. Nyshchimenko, Grigory G. Alexandrov, Igor L. Eremenko, Zdeněk Trávníček, Miki Hasegawa i Wolfgang Linert. "Versatile coordination modes of bis[5-(2-pyridine-2-yl)-1,2,4-triazole-3-yl]alkanes in Cu(ii) complexes". Dalton Trans. 43, nr 19 (2014): 7153–65. http://dx.doi.org/10.1039/c4dt00462k.

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Nine new mononuclear and polynuclear Cu(ii) complexes containing [5-(2-pyridine-2-yl)-1,2,4-triazole-3-yl]alkanes (H₂Lⁿ, n = 1–4) were synthesized and characterized by various techniques.

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20

Igawa, Kosuke, Nobuto Yoshinari i Takumi Konno. "Proton-controlled formation and interconversion of AuI2NiII trinuclear and AuI4NiII3 heptanuclear complexes with mixed thiomalate and bis(diphenylphosphino)ethane". Chem. Commun. 50, nr 98 (2014): 15573–76. http://dx.doi.org/10.1039/c4cc07578a.

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A unique coordination system with linear Au^I and octahedral Ni^II centers, in which two polynuclear structures with different nuclearities are independently formed and inter-converted in response to solution acidities, is reported.

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21

Li, Man, Xiao-Yang Qiu, Z. X. Zheng i Y. J. Wu. "SYNTHESES AND CRYSTAL STRUCTURES OF COPPER(II) AND ZINC(II) COMPLEXES DERIVED FROM 5-BROMO-2-((CYCLOPROPYLIMINO)METHYL)PHENOL WITH ANTIBACTERIAL ACTIVITY". Журнал структурной химии 64, nr 3 (2023): 106829. http://dx.doi.org/10.26902/jsc_id106829.

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Four new complexes of copper(II) and zinc(II), [Cu2L4] (1), [Cu2L2(N(CN)2)2]n (2), [Zn(HL)2I2] (3) and [Zn(HL)2(NCS)2] (4), where L is 5-bromo-2-((cyclopropylimino)methyl)phenolate, HL is the zwitterionic form of 5-bromo-2-((cyclopropylimino)methyl)phenol, were synthesized and characterized by elemental analysis and IR and UV-Vis spectroscopy. Structures of the complexes were further confirmed by single crystal X-ray structure determination. Complex 1 is a phenolate bridged dinuclear copper(II) compound, with the Cu atom in square pyramidal coordination. Complex 2 is a phenolate and dicyanamide bridged polynuclear copper(II) compound, with the Cu atom in square pyramidal coordination. Complexes 3 and 4 are mononuclear zinc(II) compounds, with the Zn atoms in tetrahedral coordination. The compounds were assayed for their antimicrobial activities. Complexes 1 and 2 have the most activities on B. subtilis, with MIC values of 1.2 μg mL–1.

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22

Qian, Heng-Yu. "Synthesis, Characterization and Crystal Structures of Zinc(II) and Cobalt(III) Complexes Derived from Tridentate NNO- and NON- Schiff Bases with Antibacterial Activities". Acta Chimica Slovenica 68, nr 3 (15.09.2021): 700–708. http://dx.doi.org/10.17344/acsi.2021.6721.

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Two new polynuclear zinc complexes [Zn2Br2(L1)2] (1) and [Zn(μ1,5-dca)L2]n (2), and two new mononuclear cobalt(III) complexes [CoL1N3(Brsal)] (3) and [CoL2(HL2)] (4), where L1 = 5-bromo-2-(((2-dimethylamino)ethyl)imino)methyl)phenolate, L2 = 5-bromo-2-(((2-hydroxyethyl)imino)methyl)phenolate, dca = dicyanoamide, Brsal = 5-bromo-2-formylphenolate, have been synthesized and characterized. The complexes were characterized by elemental analyses, IR, UVVis spectra, molar conductivity, and single crystal X-ray diffraction. X-ray analysis indicates that the Zn atoms in complex 1 are in distorted square pyramidal coordination, the Zn atoms in complex 2 are in distorted trigonal bipyramidal coordination, and the Co atoms in complexes 3 and 4 are in octahedral coordination. The molecules of the complexes are stacked through π···π interactions and hydrogen bonds. The complexes were assayed for antibacterial activities against three Gram-positive bacterial strains (B. subtilis, S. aureus, and St. faecalis) and three Gram-negative bacterial strains (E. coli, P. aeruginosa, and E. cloacae) by MTT method.

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23

Sokolov, Maxim N., Alexander V. Anyushin, Rita Hernandez-Molina, Rosa Llusar i Manuel G. Basallote. "Hydroxylated phosphines as ligands for chalcogenide clusters: self assembly, transformations and stabilization". Pure and Applied Chemistry 89, nr 3 (1.03.2017): 379–92. http://dx.doi.org/10.1515/pac-2017-0105.

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AbstractThis contribution is a documentation of recent advances in the chemistry of chalcogenide polynuclear transition metal complexes coordinated with mono- and di-phosphines functionalized with hydroxo groups. A survey of complexes containing tris(hydroxymethyl)phosphine (THP) is presented. The influence of the alkyl chain in bidentate phosphines, bearing the P–(CH2)x–OH arms, is also analyzed. Finally, isolation and structure elucidation of the complexes with HP(OH)2, P(OH)3, As(OH)3, PhP(OH)2, stabilized by coordination to Ni(0) and Pd(0) centers embedded into chalcogenide clusters, is discussed.

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24

Stanojevic, Ivana, Nada Savic, Aurélien Crochet, Katharina Fromm, Milos Djuran i Biljana Glisic. "Synthesis and structural analysis of polynuclear silver(I) complexes with 4,7-phenanthroline". Journal of the Serbian Chemical Society 84, nr 7 (2019): 689–99. http://dx.doi.org/10.2298/jsc190226024s.

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New polynuclear silver(I) complexes, [Ag(CF3SO3)(4,7-phen)(CH3CN)]n (1) and [Ag(PO2F2)(4,7-phen)]n (2), were synthesized by the reaction of 4,7-phenanthroline (4,7-phen) and the corresponding AgX salt (X = CF3SO3 - and PF6 -) in 1:2 mole ratio, respectively, in methanol/acetone (1:1 volume ratio) at room temperature. The characterization of the complexes was established on the basis of elemental microanalysis, IR and NMR (1H and 13C) spectroscopic techniques, while their crystal structures were determined by single-crystal X-ray diffraction analysis. The results of spectroscopic and crystallographic analyses revealed that in these complexes, 4,7-phen behaves as a bridging ligand between two metal ions, while the remaining coordination sites of the Ag(I) ions are occupied by the oxygen atom of CF3SO3 - and an acetonitrile nitrogen atom in 1 or by two oxygen atoms from two PO2F2 -, formed after hydrolysis of PF6 -, in 2. In the solid state, both complexes are coordination polymers in which the geometry around the Ag(I) ions is distorted tetrahedral.

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25

Saloutin, Viktor I., Yulia O. Edilova, Yulia S. Kudyakova, Yanina V. Burgart i Denis N. Bazhin. "Heterometallic Molecular Architectures Based on Fluorinated β-Diketone Ligands". Molecules 27, nr 22 (15.11.2022): 7894. http://dx.doi.org/10.3390/molecules27227894.

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This review summarizes the data on the synthesis of coordination compounds containing two or more different metal ions based on fluorinated β-diketonates. Heterometallic systems are of high interest in terms of their potential use in catalysis, medicine and diagnostics, as well as in the development of effective sensor devices and functional materials. Having a rich history in coordination chemistry, fluorinated β-diketones are well-known ligands generating a wide variety of heterometallic complexes. In this context, we focused on both the synthetic approaches to β-dicarbonyl ligands with additional coordination centers and their possible transformations in complexation reactions. The review describes bi- and polynuclear structures in which β-diketones are the key building blocks in the formation of a heterometallic framework, including the examples of both homo- and heteroleptic complexes.

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26

Fuller, Rebecca O., Karen L. Livesey, Robert C. Woodward, Allan J. McKinley, Brian W. Skelton i George A. Koutsantonis. "Magnetic Studies of Metal Ion Coordination Clusters Encapsulated with Thiacalixarene". Australian Journal of Chemistry 67, nr 11 (2014): 1588. http://dx.doi.org/10.1071/ch14136.

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Three thiacalix[4]arene polynuclear complexes have been prepared by literature methods for detailed magnetic investigation. The [Fe3O(L)2] (LH4 = thiacalix[4]arene) complex is found to exhibit interesting anti-ferromagnetic exchange coupling. Jahn–Teller distortion in [Cu4(L)2] complex leads to strong anti-ferromagnetic coupling at low temperatures. The temperature-dependent susceptibility of the [(μ-H2O)Eu2(LH)2(DMF)4] complex is well described by a ground state involving the thermal population of the lowest three excited states.

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27

von Rekowski, Felicitas, i Ruth M. Gschwind. "Polynuclear Phosphoramidite Copper Complexes with Mixed Trigonal/Tetrahedral Coordination in THF". Organometallics 33, nr 21 (30.09.2014): 6259–62. http://dx.doi.org/10.1021/om500751q.

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Užarević, Krunoslav, Gordana Pavlović i Marina Cindrić. "Mononuclear and polynuclear molybdenum(vi) complexes with the interchangeable coordination site". Polyhedron 52 (marzec 2013): 294–300. http://dx.doi.org/10.1016/j.poly.2012.09.023.

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29

Massoud, Salah S., Franz A. Mautner, Febee R. Louka, Serhiy Demeshko, Sebastian Dechert i Franc Meyer. "Diverse coordination of polynuclear copper(II) complexes constructed from benzene tetracarboxylates". Inorganica Chimica Acta 370, nr 1 (maj 2011): 435–43. http://dx.doi.org/10.1016/j.ica.2011.02.019.

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30

Forniés, Juan, Antonio Martín, Violeta Sicilia i L. Francisco Martín. "Polynuclear Palladium Complexes with 3,5-Dimethylpyrazolate Exhibiting Three Different Coordination Modes". Chemistry - A European Journal 9, nr 14 (21.07.2003): 3427–35. http://dx.doi.org/10.1002/chem.200204648.

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Katkova, Marina A., Grigory Y. Zhigulin, Roman V. Rumyantcev, Galina S. Zabrodina, Vladimir R. Shayapov, Maxim N. Sokolov i Sergey Y. Ketkov. "Water-Soluble Bismuth(III) Polynuclear Tyrosinehydroximate Metallamacrocyclic Complex: Structural Parallels to Lanthanide Metallacrowns". Molecules 25, nr 19 (23.09.2020): 4379. http://dx.doi.org/10.3390/molecules25194379.

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Recently there has been a great deal of interest and associated research into aspects of the coordination chemistry of lanthanides and bismuth—elements that show intriguing common features. This work focuses on the synthesis and characterization of a novel bismuth(III) polynuclear metallamacrocyclic complex derived from aminohydroxamic acid, in order to compare the coordination ability of Bi3+ with the similarly sized La3+ ions. A polynuclear tyrosinehydroximate Bi(OH)[15-MCCu(II)Tyrha-5](NO3)2 (1) was obtained according to the synthetic routes previously described for water-soluble Ln(III)-Cu(II) 15-MC-5 metallacrowns. Correlations between structural parameters of Bi(III) and Ln(III) complexes were analyzed. DFT calculations confirmed the similarity between molecular structures of the model bismuth(III) and lanthanum(III) tyrosinehydroximate 15-metallacrowns-5. Analysis of the electronic structures revealed, however, stronger donor-acceptor interactions between the central ion and the metallamacrocycle in the case of the lanthanum analogue. Thermochromic properties of 1 were studied.

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Borovyk, Polina, Mariia Litvinchuk, Anton Bentya, Svitlana Orysyk, Yurii Zborovskiy i Nataliia Slyvka. "Zn(II) and Ag(I) complexes of N-allythioamides of pyrimidinyl (cyclohexenyl) carboxylic acids and products their proton- and iodocyclization". Ukrainian Chemistry Journal 85, nr 3 (7.06.2019): 3–19. http://dx.doi.org/10.33609/0041-6045.85.3.2019.3-19.

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The possibility of using N-allylcarbothioamide derivatives as well as products of their iodine- and proton-initiated electrophilic heterocyclizations as chelating agents in complexation reactions with Zn(II) and Ag(I) ions is shown. Processing of the obtained experimental data showed that N-allythioamides of pyrimidinyl (cyclohexenyl) carboxylic acids H2L1 – H2L3 and their proton- and iodo-cyclization products HL4, HL5 containing four nucleophilic reaction centers (two oxygen atoms of the carbonyl and hydroxyl groups and N-, S-carbothioamide groups or N-atoms of the dihydrothiazole moiety) are polydentate ligands capable of coordinating with metal ions to form stable six-membered chelate metallocycles. A series of new chelating mono-, bi- and polynuclear complexes Zn(II) and Ag (I) of the composition [Zn2L1,32]n, [Zn2(HL1-3)2(CH3COO)2], [Ag2(HL1,3)2]n, [Zn(HL1-3)2], [Ag(H2L3)2NO3], [Zn(HL4,5)2], K[Ag(HL4,5)2] were synthesized and isolated in solid state. Their molecular structure was established by methods of elemental chemical analysis, NMR 1H, IR and UV-Vis spectroscopy. At a ratio of M:L 1:2, complexes were isolated in which two ligand molecules H2L1 − H2L3 are coordinated to the metal ion by the sulfur atoms of the carbothioamide group and the oxygen of the mono-deprotonated hydroxyl group. It was established that the products of the proton-/iodocyclization HL4, HL5 in the complex formation pass into the thione tautomeric form with coordination through the oxygen atoms of the deprotonated hydroxyl group and nitrogen atoms of the dihydrothiazole heterocycle. At M:L 1:1, binuclear or polynuclear coordination compounds are formed. It was shown that polymerisation in complexes [Zn2L1,32]n and [Ag2(HL1,3)2]n is due to the formation of Zn−(O2SN)−Zn and Ag−O−Ag polymer chains. Investigation of the solubility of the resulting complexes showed that the polymer complexes are weakly soluble or insoluble in DMSO, DMF, while the mononuclear are soluble in methanol, as well as in water.

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Borovyk, Polina, Mariia Litvinchuk, Anton Bentya, Svitlana Orysyk, Yurii Zborovskiy i Nataliia Slyvka. "Zn(II) and Ag(I) complexes of N-allythioamides of pyrimidinyl (cyclohexenyl) carboxylic acids and products their proton- and iodocyclization". Ukrainian Chemistry Journal 85, nr 3 (7.06.2019): 3–19. http://dx.doi.org/10.33609/6045.85.3.2019.3-19.

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The possibility of using N-allylcarbothioamide derivatives as well as products of their iodine- and proton-initiated electrophilic heterocyclizations as chelating agents in complexation reactions with Zn(II) and Ag(I) ions is shown. Processing of the obtained experimental data showed that N-allythioamides of pyrimidinyl (cyclohexenyl) carboxylic acids H2L1 – H2L3 and their proton- and iodo-cyclization products HL4, HL5 containing four nucleophilic reaction centers (two oxygen atoms of the carbonyl and hydroxyl groups and N-, S-carbothioamide groups or N-atoms of the dihydrothiazole moiety) are polydentate ligands capable of coordinating with metal ions to form stable six-membered chelate metallocycles. A series of new chelating mono-, bi- and polynuclear complexes Zn(II) and Ag (I) of the composition [Zn2L1,32]n, [Zn2(HL1-3)2(CH3COO)2], [Ag2(HL1,3)2]n, [Zn(HL1-3)2], [Ag(H2L3)2NO3], [Zn(HL4,5)2], K[Ag(HL4,5)2] were synthesized and isolated in solid state. Their molecular structure was established by methods of elemental chemical analysis, NMR 1H, IR and UV-Vis spectroscopy. At a ratio of M:L 1:2, complexes were isolated in which two ligand molecules H2L1 − H2L3 are coordinated to the metal ion by the sulfur atoms of the carbothioamide group and the oxygen of the mono-deprotonated hydroxyl group. It was established that the products of the proton-/iodocyclization HL4, HL5 in the complex formation pass into the thione tautomeric form with coordination through the oxygen atoms of the deprotonated hydroxyl group and nitrogen atoms of the dihydrothiazole heterocycle. At M:L 1:1, binuclear or polynuclear coordination compounds are formed. It was shown that polymerisation in complexes [Zn2L1,32]n and [Ag2(HL1,3)2]n is due to the formation of Zn−(O2SN)−Zn and Ag−O−Ag polymer chains. Investigation of the solubility of the resulting complexes showed that the polymer complexes are weakly soluble or insoluble in DMSO, DMF, while the mononuclear are soluble in methanol, as well as in water.

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Siedzielnik, Magdalena, Dimitrios A. Pantazis, Jakub Bruniecki, Kinga Kaniewska-Laskowska i Anna Dołęga. "The Reactivity of the Imine Bond within Polynuclear Nickel(II) Complexes". Crystals 11, nr 5 (5.05.2021): 512. http://dx.doi.org/10.3390/cryst11050512.

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Three novel Ni complexes with the Schiff base ligand 2-methoxy-6-(E-2-pyridyliminomethyl)-phenol (L1) are described. In comparison with the similar 2-(pyridine-2-ylimino-methyl)phenol (pymp), the mode of coordination of L1 is altered due to the presence of methoxy substituent introducing the sterical hindrance. During the synthesis of the complexes, partial hydrolysis of the ligand was observed. Since such immediate hydrolysis of L1 was not detected during the reactions of Zn(II) and Cu(II) salts with L1, the DFT calculated structures of a series of similar Zn, Cu, Ni, and Co complexes with L1 are compared to account for the phenomenon.

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Mikhalyova, Elena A., Swiatoslaw Trofimenko, Matthias Zeller, Anthony W. Addison i Vitaly V. Pavlishchuk. "New homodinuclear tris(3-alkylpyrazolyl)borate complexes of CoIIand NiIIwith a tetraacetylethane dianion as a bridging ligand". Acta Crystallographica Section C Structural Chemistry 72, nr 11 (5.10.2016): 777–85. http://dx.doi.org/10.1107/s205322961601398x.

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Polynuclear complexes and coordination polymers of 3dmetals have attracted significant interest evoked by a number of their unique properties. One of the most common approaches to the directed synthesis of coordination polymers is the linking of pre-prepared discrete coordination units by polydentate ligands. The formation of polynuclear complexes is usually a spontaneous process and precise prediction of the products of such reactions is virtually impossible in most cases. Tris(pyrazolyl)borates (Tp) act as tripodal `capping' ligands which form stable complexes with 3dmetal ions. In such 1:1 compounds, three metal-ion coordination sites are occupied by N atoms from a Tp anion. This limits the number of remaining coordination sites, and thus the number of additional ligands which may coordinate, and opens an attractive approach for the directed design of desirable structures by exploiting ligands with appropriate composition and topology. In the present study, Tp anions with neopentyl [TpNp, tris(3-neopentylpyrazolyl)borate] and cyclohexyl [TpCy, tris(3-cyclohexylpyrazolyl)borate] substituents were used as `capping' ligands and the dianion of tetraacetylethane (3,4-diacetylhexa-2,4-diene-2,5-diolate, tae2−) was employed as a bridge. The dinuclear complexes (μ-3,4-diacetylhexa-2,4-diene-2,5-diolato-κ4O2,O3:O4,O5)bis{[tris(3-cyclohexyl-1H-pyrazol-1-yl-κN2)borato]cobalt(II)} acetonitrile disolvate, [Co2(C27H40BN6)2(C10H12O4)]·2CH3CN, (I)·2CH3CN, and (μ-3,4-diacetylhexa-2,4-diene-2,5-diolato-κ4O2,O3:O4,O5)bis{[tris(3-neopentyl-1H-pyrazol-1-yl-κN2)borato]nickel(II)}, [Ni2(C24H40BN6)2(C10H12O4)], (II), were synthesized by the reaction of the mononuclear complexes TpCyCoCl or TpNpNiCl with H2tae (3,4-diacetylhexane-2,5-dione or tetraacetylethane) in the presence of NEt3as base. Compounds (I) and (II) were characterized by mass spectrometry, elemental analysis, and X-ray crystallography. They possess similar molecular structures, X-ray diffraction revealing them to be dinuclear in nature and composed of discrete Tp–Munits in which two metal ions are linked by a tae2−dianion. Each metal ion possesses a five-coordinate square-pyramidal environment. The interplanar angles between the acetylacetonate fragments are significantly smaller than the near-90° values commonly observed.

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36

Kovalchukova, Olga V., Al Tahan Rana Abdulilla Abbas, Svetlana B. Strashnova i Pavel V. Strashnov. "Tautomeric transformations and electronic structures of azopyrazolone dyes and their metal complexes". Reviews in Inorganic Chemistry 38, nr 3 (28.08.2018): 87–101. http://dx.doi.org/10.1515/revic-2018-0007.

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

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37

Fujisawa, Kiyoshi, Takuya Nemoto, Yui Morishima i Daniel B. Leznoff. "Synthesis and Structural Characterization of a Silver(I) Pyrazolato Coordination Polymer". Molecules 26, nr 4 (15.02.2021): 1015. http://dx.doi.org/10.3390/molecules26041015.

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Coinage metal(I)···metal(I) interactions are widely of interest in fields such as supramolecular assembly and unique luminescent properties, etc. Only two types of polynuclear silver(I) pyrazolato complexes have been reported, however, and no detailed spectroscopic characterizations have been reported. An unexpected synthetic method yielded a polynuclear silver(I) complex [Ag(μ-L1Clpz)]n (L1Clpz− = 4-chloride-3,5-diisopropyl-1-pyrazolate anion) by the reaction of {[Ag(μ-L1Clpz)]3}2 with (nBu4N)[Ag(CN)2]. The obtained structure was compared with the known hexanuclear silver(I) complex {[Ag(μ-L1Clpz)]3}2. The Ag···Ag distances in [Ag(μ-L1Clpz)]n are slightly shorter than twice Bondi’s van der Waals radius, indicating some Ag···Ag argentophilic interactions. Two Ag–N distances in [Ag(μ-L1Clpz)]n were found: 2.0760(13) and 2.0716(13) Å, and their N–Ag–N bond angles of 180.00(7)° and 179.83(5)° indicate that each silver(I) ion is coordinated by two pyrazolyl nitrogen atoms with an almost linear coordination. Every five pyrazoles point in the same direction to form a 1-D zig-zag structure. Some spectroscopic properties of [Ag(μ-L1Clpz)]n in the solid-state are different from those of {[Ag(μ-L1Clpz)]3}2 (especially in the absorption and emission spectra), presumably attributable to this zig-zag structure having longer but differently arranged intramolecular Ag···Ag interactions of 3.39171(17) Å. This result clearly demonstrates the different physicochemical properties in the solid-state between 1-D coordination polymer and metalacyclic trinuclear (hexanuclear) or tetranuclear silver(I) pyrazolate complexes.

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Basak, Tanmoy, Rosa M. Gomila, Antonio Frontera i Shouvik Chattopadhyay. "Differentiating intramolecular spodium bonds from coordination bonds in two polynuclear zinc(ii) Schiff base complexes". CrystEngComm 23, nr 14 (2021): 2703–10. http://dx.doi.org/10.1039/d1ce00214g.

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Two new zinc(ii) complexes have been synthesized and characterized. Theoretical study is devoted to distinguish between conventional coordination bonds and spodium bonds between the zinc and oxygen centers.

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39

Torres, Julia, Javier González-Platas i Carlos Kremer. "Lanthanide(III) Complexes with Thiodiacetato Ligand: Chemical Speciation, Synthesis, Crystal Structure, and Solid-State Luminescence". Crystals 13, nr 1 (28.12.2022): 56. http://dx.doi.org/10.3390/cryst13010056.

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The synthesis, crystal structures, and luminescence of two lanthanide polynuclear complexes with the general formula [Ln2(tda)3(H2O)5]·3H2O (Ln = Sm, Eu; tda = thiodiacetato anion) are reported. The compounds were obtained by direct reaction of H2tda and lanthanide(III) chloride in an aqueous solution. The choice of the conditions of synthesis was based on speciation studies. The structure of the polymeric complexes contains Ln(III) ions in a tricapped trigonal prism geometry. The versatility of this ligand provides different coordination modes and provokes the formation of thick 2D sheets. Direct excitation of the Ln(III) ions gives place to the characteristic intra-configuration sharp luminescence emission of both complexes in the solid state.

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40

Zhang, Li, Yuqing Gu, Xinhui Feng, Ting Yang, Xiaoyan Li, Jing Wang i Zhonglu You. "Syntheses, Characterization and Crystal Structures of Dicyanamide Bridged Polynuclear Copper(II) and Zinc(II) Complexes with Urease Inhibitory Activity". Acta Chimica Slovenica 69, nr 3 (26.09.2022): 674–80. http://dx.doi.org/10.17344/acsi.2022.7578.

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A pair of structurally similar dicyanamide bridged copper(II) and zinc(II) complexes [CuL(dca)]n (1) and [ZnL(dca)]n (2), were prepared from the fluorine containing Schiff base 5-fluoro-2-(((2-hydroxyethyl)imino)methyl)phenol (HL). The compounds were characterized by physico-chemical methods. Structures of the complexes were confirmed by single crystal X-ray diffraction. The Cu atom in complex 1 is in square pyramidal coordination, whereas the Zn atom in complex 2 is in trigonal bipyramidal coordination. The copper complex has effective Jack bean urease inhibitory activity, with IC50 value of 0.14 ± 0.12 μmol L–1.

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41

Semeniuc, Radu F., Daniel L. Reger i Mark D. Smith. "Silver(I) and rhenium(I) metal complexes of a 2,2′-bipyridine-functionalized third-generation tris(pyrazolyl)methane ligand". Acta Crystallographica Section C Structural Chemistry 72, nr 11 (5.10.2016): 826–31. http://dx.doi.org/10.1107/s2053229616012171.

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Heterotopic ligands offer the possibility of preparing polynuclear bimetallic complexes. Recent studies of heteroditopic ligands and their metal complexes have focused on novel supramolecular systems, biological activity, and the development of MRI contrast agents. The heteroditopic ligand Bipy–CH2–O–CH2–C(pz)3(Bipy-L; Bipy is 2,2′-bipyridine and pz is pyrazolyl) reacts with AgBF4to produce the coordination polymercatena-poly[[silver(I)-(μ-5-{[tris(pyrazol-1-yl)methoxy]methyl-κ2N,N′}-2,2′-bipyridine-κ2N,N′)] diethyl ether hemisolvate], {[Ag(C22H20N8O)]BF4·0.5C4H10O}n, and with Re(CO)5Br to form the discrete compound bromidotricarbonyl(5-{[tris(pyrazol-1-yl)methoxy]methyl}-2,2′-bipyridine-κ2N,N′)rhenium(I), [ReBr(C22H20N8O)(CO)3]. The silver(I) compound is a one-dimensional coordination polymer, built up by a κ2coordination mode of the bipyridine group and a κ2–κ0coordination mode of the –C(pz)3donor set. In [ReBr(Bipy-L)(CO)3], the ligand coordinates onlyviathe bipyridine end, leaving the –C(pz)3donor set free for further coordination interactions.

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Mykhalichko, B. M., Oleg N. Temkin i M. G. Mys'kiv. "Polynuclear complexes of copper(I) halides: coordination chemistry and catalytic transformations of alkynes". Russian Chemical Reviews 69, nr 11 (30.11.2000): 957–84. http://dx.doi.org/10.1070/rc2000v069n11abeh000609.

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Arıcı, Mürsel, Okan Zafer Yeşilel, Onur Şahin i Murat Taş. "Dinuclear and polynuclear copper(II) complexes with 3,3′-thiodipropionate and unprecedented coordination mode". Polyhedron 71 (marzec 2014): 62–68. http://dx.doi.org/10.1016/j.poly.2014.01.005.

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44

Swavey, Shawn, i Rochael Swavey. "Dinuclear and polynuclear lanthanide coordination complexes containing polyazine ligands: Synthesis and luminescent properties". Coordination Chemistry Reviews 253, nr 21-22 (listopad 2009): 2627–38. http://dx.doi.org/10.1016/j.ccr.2009.05.015.

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45

Adams, Richard D., Mingsheng Huang, John H. Yamamoto i Lijuan Zhang. "The Coordination ofN,N-Diethyl-N′-p-tolylthiourea to Polynuclear Rhenium Carbonyl Complexes". Chemische Berichte 129, nr 2 (luty 1996): 137–42. http://dx.doi.org/10.1002/cber.19961290205.

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46

Fu, Ming-Lai, Dieter Fenske, Bastian Weinert i Olaf Fuhr. "One-Dimensional Coordination Polymers Containing Polynuclear (Selenolato)copper Complexes Linked by Bipyridine Ligands". European Journal of Inorganic Chemistry 2010, nr 7 (marzec 2010): 1098–102. http://dx.doi.org/10.1002/ejic.200900711.

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Miroslaw, Barbara. "Homo- and Hetero-Oligonuclear Complexes of Platinum Group Metals (PGM) Coordinated by Imine Schiff Base Ligands". International Journal of Molecular Sciences 21, nr 10 (15.05.2020): 3493. http://dx.doi.org/10.3390/ijms21103493.

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Chemistry of Schiff base (SB) ligands began in 1864 due to the discovery made by Hugo Schiff (Schiff, H., Justus Liebigs Ann. der Chemie 1864, 131 (1), 118–119). However, there is still a vivid interest in coordination compounds based on imine ligands. The aim of this paper is to review the most recent concepts on construction of homo- and hetero-oligonuclear Schiff base coordination compounds narrowed down to the less frequently considered complexes of platinum group metals (PGM). The combination of SB and PGM in oligonuclear entities has several advantages over mononuclear or polynuclear species. Such complexes usually exhibit better electroluminescent, magnetic and/or catalytic properties than mononuclear ones due to intermetallic interactions and frequently have better solubility than polymers. Various construction strategies of oligodentate imine ligands for coordination of PGM are surveyed including simple imine ligands, non-innocent 1,2-diimines, chelating imine systems with additional N/O/S atoms, classic N2O2-compartmental Schiff bases and their modifications resulting in acyclic fused ligands, macrocycles such as calixsalens, metallohelical structures, nano-sized molecular wheels and hybrid materials incorporating mesoionic species. Co-crystallization and formation of metallophilic interactions to extend the mononuclear entities up to oligonuclear coordination species are also discussed.

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Wang, Yingying, Meixia Wen, Zhongjun Gao i Ning Sheng. "Crystal structure and magnetic properties of a linear tetranuclear CoIIcluster". Acta Crystallographica Section C Structural Chemistry 72, nr 9 (25.08.2016): 697–700. http://dx.doi.org/10.1107/s205322961601281x.

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Polynuclear complexes are an important class of inorganic functional materials and are of interest particularly for their applications in molecular magnets. Multidentate chelating ligands play an important role in the design and syntheses of polynuclear metal clusters. A novel linear tetranuclear CoIIcluster, namely bis{μ3-(E)-2-[(2-oxidobenzylidene)amino]phenolato}bis{μ2-(E)-2-[(2-oxidobenzylidene)amino]phenolato}bis(1,10-phenanthroline)tetracobalt(II), [Co4(C14H11NO2)4(C12H8N2)2], was prepared under solvothermal conditions through a mixed-ligand synthetic strategy. The structure was determined by X-ray single-crystal diffraction and bulk purity was confirmed by powder X-ray diffraction. The complex molecule has a centrosymmetric tetranuclear chain-like structure and the four CoIIions are located in two different coordination environments. The CoIIions at the ends of the chain are in a slightly distorted octahedral geometry, while the two inner CoIIions are in five-coordinate distorted trigonal bipyramidal environments. A magnetic study reveals ferromagnetic CoII...CoIIexchange interactions for the complex.

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Sarjanović, Josipa, Martina Stojić, Mirta Rubčić, Luka Pavić i Jana Pisk. "Impedance Spectroscopy as a Powerful Tool for Researching Molybdenum-Based Materials with Schiff Base Hydrazones". Materials 16, nr 3 (25.01.2023): 1064. http://dx.doi.org/10.3390/ma16031064.

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Molybdenum coordination complexes are widely applied due to their biological and pharmacological potential, as well as their performance in different catalytic processes. Parent dioxidomolybdenum Schiff base complexes were prepared via the reaction of [MoO2(acac)2] with a hydrazone Schiff-base tetradentate ligand. A new hydrazone-Schiff base (H2L1 and 2) and its corresponding mononuclear and polynuclear dioxidomolybdenum(VI) complex were synthesized and characterized by spectroscopic methods and elemental analyses, and their thermal behavior was investigated by thermogravimetry. The crystal and molecular structures of H2L2 ligands and the complexes [MoO2(L1)(H2O)], [MoO2(L2)(H2O)], [MoO2(L1)(MeOH)]∙MeOH, [MoO2(L1)(EtOH)]∙EtOH, [MoO2(L1)(2-PrOH)]∙2-PrOH, and [MoO2(L1)]n were determined by single-crystal X-ray diffraction. Using the in situ impedance spectroscopy method (IS), the structural transformations of chosen complexes were followed, and their electrical properties were examined in a wide range of temperatures and frequencies.

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Castro, Isabel, M. Luisa Calatayud, Marta Orts-Arroyo, Nadia Marino, Giovanni De Munno, Francesc Lloret, Rafael Ruiz-García i Miguel Julve. "Oxalato as polyatomic coordination center and magnetic coupler in copper(II)-polypyrazole inverse polynuclear complexes and coordination polymers". Coordination Chemistry Reviews 471 (listopad 2022): 214730. http://dx.doi.org/10.1016/j.ccr.2022.214730.

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