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Synthesis, spectroscopic, solid-state electrical conductivity, and thermal analysis of Cu(II) doped Zn(II) heterobimetallic complexes derived from 2,5-dichloro-3,6-bis-(methylamino)1,4-benzoquinone. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Jakusch T, Hassoon AA, Kiss T. Characterization of copper(II) specific pyridine containing ligands: Potential metallophores for Alzheimer's disease therapy. J Inorg Biochem 2021; 228:111692. [PMID: 34990971 DOI: 10.1016/j.jinorgbio.2021.111692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 11/29/2021] [Accepted: 12/03/2021] [Indexed: 10/19/2022]
Abstract
Two amide group containing pyridine derivatives, N-(pyridin-2-ylmethyl)picolinamide (PMPA) and N-(pyridin-2-ylmethyl)-2-((pyridin-2-ylmethyl)amino)acetamide (DPMGA), have been investigated as potential metallo-phores in the therapy of Alzheimer's disease. Their complex formation with Cu(II) and Zn(II) were characterized in details. Unexpectedly not only the Cu(II) but also the Zn(II) was able to induce deprotonation of the amide-NH, however, it occurred only at higher pH or at higher metal ion concentrations than the biological conditions. At μM concentration level mono complexes (MLH-1) dominate with both ligands. Direct fluorescence and reactive oxygen species (ROS) producing measurements prove that both ligands are able to remove Cu(II) from its amyloid-β complexes (CuAβ). Correlation was also established between the conditional stability constant of the Cu(II) complexes with different ligands and their ability of inhibition of ROS production by CuAβ.
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Affiliation(s)
- Tamás Jakusch
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
| | - Azza A Hassoon
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Tamás Kiss
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
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3
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Singh N, Niklas J, Poluektov O, Van Heuvelen KM, Mukherjee A. Mononuclear nickel (II) and copper (II) coordination complexes supported by bispicen ligand derivatives: Experimental and computational studies. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.09.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Prasad R, Kushwaha A, Shrivastava O. Synthesis, characterization and solid state electrical properties of 1-D coordination polymer of the type [CuxNi1−x(dadb)·yH2O]n. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.07.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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5
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Prasad R, Kushwaha A. Synthesis, characterization, and solid state electrical conductivity of coordination polymers with copper and zinc. J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.733817] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- R.L. Prasad
- a Department of Chemistry, Faculty of Science , Banaras Hindu University , Varanasi-221005 , India
| | - Anita Kushwaha
- a Department of Chemistry, Faculty of Science , Banaras Hindu University , Varanasi-221005 , India
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6
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Mack K, Wünsche von Leupoldt A, Förster C, Ezhevskaya M, Hinderberger D, Klinkhammer KW, Heinze K. Effect of Chelate Ring Expansion on Jahn–Teller Distortion and Jahn–Teller Dynamics in Copper(II) Complexes. Inorg Chem 2012; 51:7851-8. [DOI: 10.1021/ic300929g] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katharina Mack
- Institute
of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Anica Wünsche von Leupoldt
- Institute
of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Christoph Förster
- Institute
of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Maria Ezhevskaya
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Dariush Hinderberger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Karl W. Klinkhammer
- Institute
of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Katja Heinze
- Institute
of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
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Bai SQ, Yong AM, Hu JJ, Young DJ, Zhang X, Zong Y, Xu J, Zuo JL, Hor TSA. Zinc, cobalt and copper coordination polymers with different structural motifs from picolyl-triazole hybrid ligands. CrystEngComm 2012. [DOI: 10.1039/c1ce05808h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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8
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Sadhukhan D, Rizzoli C, Garribba E, Gómez-García CJ, Yahia-Ammar A, Charbonnière LJ, Mitra S. A novel mixed valent CuII–CuI 2D framework made of a hydrazone and μ-SCN bridged metallacyclic loops cross-linked by μ3-SCN chains. Dalton Trans 2012; 41:11565-8. [DOI: 10.1039/c2dt31666h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Crystal structure, spectroscopic, magnetic and theoretical studies of [bis(hippurato)bis(benzimidazole)copper(II)] propanol 1/4hydrate. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.07.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Prasad RL, Kushwaha A, Gautam BPS. Mixed ligand complexes of β-diketonates: synthesis, characterization, and FAB mass spectral analysis. J COORD CHEM 2009. [DOI: 10.1080/00958970902954102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Ram Lakhan Prasad
- a Faculty of Science, Department of Chemistry , Banaras Hindu University , Varanasi–221005, India
| | - Anita Kushwaha
- a Faculty of Science, Department of Chemistry , Banaras Hindu University , Varanasi–221005, India
| | - Bhanu Pratap S. Gautam
- a Faculty of Science, Department of Chemistry , Banaras Hindu University , Varanasi–221005, India
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11
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Bai SQ, Koh LL, Hor TSA. Structures of Copper Complexes of the Hybrid [SNS] Ligand of Bis(2-(benzylthio)ethyl)amine and Facile Catalytic Formation of 1-Benzyl-4-phenyl-1H-1,2,3-triazole through Click Reaction. Inorg Chem 2009; 48:1207-13. [DOI: 10.1021/ic801690v] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Shi-Qiang Bai
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Lip Lin Koh
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - T. S. Andy Hor
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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Baranwal BP, Das SS, Singh P. Hydroxycarboxylato Complexes of Copper(II): Synthesis and Characterization. ACTA ACUST UNITED AC 2008. [DOI: 10.1080/00945719809349423] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- B. P. Baranwal
- a Chemistry Department , Gorakhpur University , Gorakhpur, 273 009, India
| | - S. S. Das
- a Chemistry Department , Gorakhpur University , Gorakhpur, 273 009, India
| | - Punam Singh
- a Chemistry Department , Gorakhpur University , Gorakhpur, 273 009, India
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Schepetkin I, Potapov A, Khlebnikov A, Korotkova E, Lukina A, Malovichko G, Kirpotina L, Quinn MT. Decomposition of reactive oxygen species by copper(II) bis(1-pyrazolyl)methane complexes. J Biol Inorg Chem 2006; 11:499-513. [PMID: 16680452 DOI: 10.1007/s00775-006-0101-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2005] [Accepted: 03/17/2006] [Indexed: 01/13/2023]
Abstract
Two bis(1-pyrazolyl)alkane ligands, bis(3,5-dimethyl-1-pyrazolyl)methane and bis(4-iodo-3,5-dimethyl-1-pyrazolyl)methane, and their copper(II) complexes, bis(3,5-dimethyl-1-pyrazolyl)methanedinitratocopper(II) [CuL1(NO3)2] and bis(4-iodo-3,5-dimethyl-1-pyrazolyl)methanedinitratocopper(II) [CuL2(NO3)2] x 2H2O, were prepared. Physiochemical properties of the copper(II) complexes were studied by spectroscopic (UV-vis, IR, EPR) techniques and cyclic voltammetry. Spectroscopic analysis revealed a 1:1 stoichiometry of ligand:copper(II) ion and a bidentate coordination mode for the nitrate ions in both of the complexes. According to experimental and theoretical ab initio data, the copper(II) ion is located in an octahedral hexacoordinated environment. Both complexes were able to catalyze the dismutation of superoxide anion (O2*-) (pH 7.5) and decomposition of H2O2 (pH 7.5) and peroxynitrite (pH 10.9). In addition, both complexes exhibited superoxide dismutase (SOD) like activity toward extracellular and intracellular reactive oxygen species produced by activated human neutrophils in whole blood. Thus, these complexes represent useful SOD mimetics with a broad range of antioxidant activity toward a variety of reactive oxidants.
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Affiliation(s)
- Igor Schepetkin
- Department of Veterinary Molecular Biology, Montana State University, Bozeman, MT 59717, USA
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Efthimiadou EK, Sanakis Y, Katsarou M, Raptopoulou CP, Karaliota A, Katsaros N, Psomas G. Neutral and cationic mononuclear copper(II) complexes with enrofloxacin: structure and biological activity. J Inorg Biochem 2006; 100:1378-88. [PMID: 16740311 DOI: 10.1016/j.jinorgbio.2006.03.013] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2005] [Revised: 03/14/2006] [Accepted: 03/21/2006] [Indexed: 11/22/2022]
Abstract
The mononuclear copper complexes with the quinolone antibacterial drug enrofloxacin (=Herx) in the presence or not of a nitrogen donor heterocyclic ligand 1,10-phenanthroline (=phen) and 2,2'-bipyridine (=bipy) have been prepared and characterized. Interaction of copper(II) with deprotonated enrofloxacin leads to the formation of the neutral complex Cu(erx)2(H2O), 1, while the presence of phen or bipy leads to the formation of a neutral or a cationic mononuclear complex, respectively. The crystal structures of (chloro)(1,10-phenanthroline)(enrofloxacinato)copper(II), 2, and (aqua)(2,2'-bipyridine)(enrofloxacinato)copper(II) chloride, 3, have been determined with X-ray crystallography. The complexes have been studied with X-band electron paramagnetic resonance in aqueous solutions at liquid helium temperature. The study of the interaction of the complexes with calf-thymus DNA has been performed with diverse spectroscopic techniques and has showed that all complexes are bound to DNA by the intercalative mode. The antimicrobial efficiency of the complexes has been tested on three different microorganisms and the available evidence supports that the best inhibition is provided by Cu(erx)2(H2O) (minimum inhibitory concentration=0.125 microg mL(-1)) against Escherichia coli and Pseudomonas aeruginosa.
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Affiliation(s)
- Eleni K Efthimiadou
- Institute of Physical Chemistry, NCSR "Demokritos", 15310 Aghia Paraskevi Attikis, Greece
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15
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Pintauer T, Matyjaszewski K. Structural aspects of copper catalyzed atom transfer radical polymerization. Coord Chem Rev 2005. [DOI: 10.1016/j.ccr.2004.11.010] [Citation(s) in RCA: 246] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Sakai KI, Akutagawa T, Hasegawa T, Nakamura T. The d-L(π)-π type of charge-transfer salt [Cu(Me-tri)2][Ni(dmit)2]2: Interaction between copper(ii) d- and Ni(dmit)2π-electrons via π-conjugated macrocyclic ligands. Phys Chem Chem Phys 2003. [DOI: 10.1039/b212555b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Synthesis and structure of the mixed ligand complex of copper(II), bis(9,10-dihydro-9-oxo-10-acridineacetato)bis(imidazole)copper(II) tetrahydrate. Polyhedron 2002. [DOI: 10.1016/s0277-5387(02)01154-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Riley MJ. Geometric and Electronic Information from the Spectroscopy of Six-Coordinate Copper(II) Compounds. ACTA ACUST UNITED AC 2000. [DOI: 10.1007/3-540-44474-2_2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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19
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Psomas G, Raptopoulou CP, Iordanidis L, Dendrinou-Samara C, Tangoulis V, Kessissoglou DP. Structurally diverse copper(II)-carboxylato complexes: neutral and ionic mononuclear structures and a novel binuclear structure. Inorg Chem 2000; 39:3042-8. [PMID: 11196899 DOI: 10.1021/ic991476q] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The copper complexes with the commercial auxin herbicides MCPA, 2,4-D, and 2,4,5-T in the presence of a nitrogen donor heterocyclic ligand, phen or bipyam, were prepared and characterized. The available evidence supports a dimeric structure for the 2,4-D complex in the presence of bipyam while phen leads to monomeric forms. The EPR spectrum of Cu2(2,4-D)4(bipyam)2 at 4 K in the solid state exhibits an axial signal which corresponds to almost isolated S = 1/2 magnetic ions. Magnetic data for the dimer show a weak antiferromagnetic interaction between the two metal ions with J = -08 cm-1. The crystal structures of tetrakis[(2,4-dichlorophenoxy)acetato]bis(2,2'-bipyridylamine)dicopper(II), 1, bis(1,10-phenanthroline)[(2,4,5-trichlorophenoxy)acetato]copper(II) chloride, 2, and aqua(1,10-phenanthroline)bis[((2-methyl-4-chlorophenoxyacetato]copper(II), 3, were determined and refined by least-squares methods using three-dimensional MoK alpha data. 1 crystallizes in space group P1, in a cell of dimensions a = 10813(1) A, b = 12138(1) A, c = 11909(1) A, alpha = 86448(3) degrees, beta = 80127(3) degrees, and gamma = 63982(3) degrees, and V = 13837(2) A3, with Z = 1 2 crystallizes in space group I2/a, in a cell of dimensions a = 29958(9) A, b = 11342(3) A, c = 21196(7) A, beta = 10794(1) degrees, and V = 68522(4) A3, with Z = 8 3 crystallizes in space group P1, in a cell of dimensions a = 87419(8) A, b = 12512(1) A, c = 14598(1) A, alpha = 110737(1) degrees, beta = 95742(2) degrees, gamma = 103286(2) degrees, V = 14241(2) A3, with Z = 2.
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Affiliation(s)
- G Psomas
- Department of General and Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54006, Greece
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20
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Li Y, Lai YH, Mok K, Drew MG. Synthesis and metal complexes of a chelating ligand containing thiomorpholine and pyridine: 2,6-bis(thiomorpholinomethyl)pyridine. Inorganica Chim Acta 1998. [DOI: 10.1016/s0020-1693(98)00132-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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Raptopoulou CP, Papadopoulos AN, Malamatari DA, Ioannidis E, Moisidis G, Terzis A, Kessissoglou DP. Ni(II) and Cu(II) schiff base complexes with an extended H-bond network. Inorganica Chim Acta 1998. [DOI: 10.1016/s0020-1693(97)05876-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Jones PL, Jeffery JC, Maher JP, McCleverty JA, Rieger PH, Ward MD. A Triangular Copper(I) Complex Displaying Allosteric Cooperativity in Its Electrochemical Behavior and a Mixed-Valence Cu(I)-Cu(I)-Cu(II) State with Unusual Temperature-Dependent Behavior. Inorg Chem 1997; 36:3088-3095. [PMID: 11669961 DOI: 10.1021/ic970088q] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction of the tris-chelating hexadentate podand ligand tris[3-(2-pyridyl)pyrazol-1-yl]hydroborate (Tp(Py)) with [Cu(MeCN)(4)][PF(6)] affords [Cu(I)(3)(Tp(Py))(2)][PF(6)] (1), which was crystallographically characterized. 1.(MeCN)(2): C(52)H(44)B(2)Cu(3)F(6)N(20)P, orthorhombic, Pna2(1); a = 24.592(7), b = 16.392(5), c = 13.365(5) Å; Z = 4. Each Cu(I) ion is four coordinated by one N,N '-bidentate arm from each ligand; each ligand therefore donates each bidentate arm to a different Cu(I) ion. The isosceles triangular arrangement of Cu(I) ions with N-donor ligands is reminiscent of the tricopper(I) site of ascorbate oxidase. One-electron oxidation of 1 affords the Cu(I)(2)Cu(II) complex [Cu(3)(Tp(Py))(2)][PF(6)](2) (2). The potentials of the Cu(I)/Cu(II) redox couples are affected by the ease with which the accompanying geometric rearrangement can occur. Thus, the first oxidation of 1 is facile (-0.52 V vs the ferrocene/ferrocenium couple, Fc/Fc(+)), but as a result of the concomitant structural rearrangement the second oxidation is rendered much more difficult (+0.12 V vsFc/Fc(+)) and results in slow decomposition of the product. A third oxidation does not occur at accessible potentials. This complex therefore exhibits negative cooperative behavior, in which the geometric change accompanying one metal-based redox change hinders further redox changes at other sites via an allosteric effect. EPR studies on the mixed-valence complex 2 show that in frozen glasses below 120 K the unpaired electron is delocalized over two metal centers (7-line spectrum), but above 160 K the electron becomes localized and gives a simple axial spectrum. The electronic spectrum of 2 in solution shows an intense band at 910 nm (epsilon 2100 dm(3) mol(-)(1) cm(-)(1)) which we believe to be an IVCT band. The combination of EPR and electronic spectral studies show that 2 is class III (fully delocalized over 2 centers) below 120 K but class II (localized but strongly interacting) at higher temperatures.
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Affiliation(s)
- Peter L. Jones
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K., and Department of Chemistry, Brown University, Providence, Rhode Island 02912
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Kovala-Demertzi D, Theodorou A, Demertzis MA, Raptopoulou CP, Terzis A. Synthesis and characterization of tetrakis-μ-2-[(2,6dichlorophenyl) amino] benzeneacetodiaquodicopper(II) dihydrate and tetrakis-μ-2-[(2,6dichlorophenyl)amino]benzeneaceto dimethylformamidodicopper(II). J Inorg Biochem 1997. [DOI: 10.1016/s0162-0134(96)00101-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Rentschler E, Gatteschi D, Cornia A, Fabretti AC, Barra AL, Shchegolikhina OI, Zhdanov AA. Molecule-Based Magnets: Ferro- and Antiferromagnetic Interactions in Copper(II)-Polyorganosiloxanolate Clusters. Inorg Chem 1996; 35:4427-4431. [PMID: 11666662 DOI: 10.1021/ic951317g] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The magnetic behavior of the clusters [(PhSiO(2))(6)Cu(6)(O(2)SiPh)(6)].6EtOH (1), Na(4)[(PhSiO(2))(12)Cu(4)].8(n)()BuOH (2), and K(4)[(C(2)H(3)SiO(2))(12)Cu(4)].6(n)()BuOH (3) has been investigated by combined magnetic susceptibility measurements and variable-temperature EPR techniques (9.25 and 245 GHz). The six copper(II) ions in the core of 1, which approaches 6/mmm symmetry, are ferromagnetically coupled as a result of the geometry at the bridging siloxanolate oxygen atoms (Cu-O-Cu = 91.5-94.6 degrees; J = -42 cm(-)(1) with H = J S(i)().S(i)()(+1), S(7) = S(1)). The ground S = 3 spin state is split in zero field mainly due to anisotropic exchange contributions (D = 0.30 cm(-)(1)). Notably, both the magnitude and the sign of the zero-field splitting parameter have been determined from HF-EPR spectra. Large antiferromagnetic Cu-Cu interactions (J approximately 200 cm(-)(1)) and an S = 0 ground state have been detected in the tetranuclear clusters 2 and 3 as a consequence of the larger Cu-O-Cu angles. The results presented in the paper are relevant to the search for new molecule-based magnetic materials.
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Affiliation(s)
- Eva Rentschler
- Department of Chemistry, University of Florence, via Maragliano 75, 50144 Firenze, Italy, Department of Chemistry, University of Modena, via G. Campi 183, 41100 Modena, Italy, Laboratoire des Champs Magnetiques Intenses, CNRS, Grenoble, France, and A. N. Nesmeyanov Institute of Organoelement Compounds (INEOS), 28 Vavilov St., Moscow 117813, Russia
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Garoufis A, Louloudi M, Kasselouri S, Hatiris J, Hadjiliadis N. Ternary complexes of copper(II) containing inosine (Ino), guanosine (Guo) and the dipeptides, GLY-GLY, GLY-l-ALA, GLY-l-VAL and GLY-l-LEU. Polyhedron 1995. [DOI: 10.1016/0277-5387(94)00381-n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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27
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Subraminian R, Sastry B, Ponticelli G, Matovic Z. Spectroscopic studies on some mixed-ligand metallic complexes formed with two different tridentate ligands. Polyhedron 1994. [DOI: 10.1016/s0277-5387(00)83021-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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29
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Dendrinou-Samara C, Kessissoglou DP, Manoussakis GE, Mentzafos D, Terzis A. Copper(II) complexes with anti-inflammatory drugs as ligands. Molecular and crystal structures of bis(dimethyl sulphoxide)tetrakis(6-methoxy-α-methyl-2-naphthaleneacetato)dicopper(II) and bis(dimethyl sulphoxide)tetrakis[1-methyl-5-(p-toluoyl)-1H-pyrrole-2-acetato]dicopper(II). ACTA ACUST UNITED AC 1990. [DOI: 10.1039/dt9900000959] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Oberhausen K, Richardson J, Buchanan R, Pierce W. Synthesis, structure and properties of a N3 tridentate bis-imidazolyl ligand with copper(II). Polyhedron 1989. [DOI: 10.1016/s0277-5387(00)83829-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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