1
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Exploring different equatorial donors in a series of five-coordinate Cu(II) complexes supported by rigid tetradentate ligands. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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2
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Fukatsu A, Morimoto Y, Sugimoto H, Itoh S. Modelling a ‘histidine brace’ motif in mononuclear copper monooxygenases. Chem Commun (Camb) 2020; 56:5123-5126. [DOI: 10.1039/d0cc01392g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A mononuclear copper complex bearing a ‘histidine brace’ is synthesised and characterised as an active-site model of mononuclear copper monooxygenases such as lytic polysaccharide monooxygenases (LPMOs) and particulate methane monooxygenase (pMMO).
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Affiliation(s)
- Arisa Fukatsu
- Department of Material and Life Science
- Division of Advanced Science and Biotechnology
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
| | - Yuma Morimoto
- Department of Material and Life Science
- Division of Advanced Science and Biotechnology
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
| | - Hideki Sugimoto
- Department of Material and Life Science
- Division of Advanced Science and Biotechnology
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
| | - Shinobu Itoh
- Department of Material and Life Science
- Division of Advanced Science and Biotechnology
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
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3
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Cooperative H-bonds, π⋯π and anion⋯π interactions as driving forces in the construction of novel Cu(II) bis(imidazol-2-yl) supramolecular 3D frameworks. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.06.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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4
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Cao YD, Zheng QY, Chen CF, Huang ZT. Synthesis and Structure of Copper(II) Calix[4]Arene Tetraimidazole Complex. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823403103174641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A copper(II) complexes of calix[4]arene tetraimidazole (CTI) ligand has been prepared to mimic the active site of copper metalloproteins.
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Affiliation(s)
- Yu-Dong Cao
- Laboratory of Chemical Biology, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Qi-Yu Zheng
- Laboratory of Chemical Biology, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Chuan-Feng Chen
- Laboratory of Chemical Biology, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
| | - Zhi-Tang Huang
- Laboratory of Chemical Biology, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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5
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Supramolecular architectures in luminescent Zn(II) and Cd(II) complexes containing imidazole derivatives: Crystal structures, vibrational and thermal properties, Hirshfeld surface analysis and electrostatic potentials. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.01.028] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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New dinuclear copper complexes incorporating bis(imidazolyl) based ligands and bidentate–monodentate oxalate bridges. Crystal structure and magnetic properties of [Cu2(BIM)2(C2O4)2]·4H2O and [Cu2(BIK)2(C2O4)2] (BIM=bis(2-imidazolyl)methane), BIK=bis(2-imidazolyl)ketone). Exploring magneto-structural correlations. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.03.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Gundhla IZ, Walmsley RS, Ugirinema V, Mnonopi NO, Hosten E, Betz R, Frost CL, Tshentu ZR. pH-metric chemical speciation modeling and studies of in vitro antidiabetic effects of bis[(imidazolyl)carboxylato]oxidovanadium(IV) complexes. J Inorg Biochem 2014; 145:11-8. [PMID: 25594947 DOI: 10.1016/j.jinorgbio.2014.12.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 12/18/2014] [Accepted: 12/19/2014] [Indexed: 11/29/2022]
Abstract
A range of bidentate N,O-donor ligands of the imidazolyl-carboxylate moiety, which partially mimic naturally occurring bioligands, were prepared and reacted with the oxidovanadium(IV) ion to form the corresponding bis-coordinated oxidovanadium(IV) complexes. The aqueous pH-metric chemical speciation was investigated using glass electrode potentiometry, which allowed for the determination of protonation and stability constants of the ligands and complexes, respectively. The species distribution diagrams generated from this information gave evidence that the bis[(imidazolyl)carboxylato]oxovanadium(IV) complexes possess a broad pH-metric stability. The complexes improved glucose uptake in cell cultures using 3T3-L1 adipocytes, C2C12 muscle cells and Chang liver cells. The PTP inhibition studies indicated that the mechanism underlying insulin-stimulated glucose uptake was possibly via the protein tyrosine phosphorylation through the inhibition of the protein tyrosine phosphatase 1B (PTP 1B). The vanadium compounds also demonstrated the inhibition of D-dimer formation, suggesting that these compounds could potentially relieve a hypercoagulative state in diabetic patients.
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Affiliation(s)
- Isaac Z Gundhla
- Department of Chemistry, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
| | - Ryan S Walmsley
- Department of Chemistry, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
| | - Vital Ugirinema
- Department of Chemistry, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
| | - Nandipha O Mnonopi
- Department of Biochemistry and Microbiology, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
| | - Eric Hosten
- Department of Chemistry, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
| | - Richard Betz
- Department of Chemistry, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
| | - Carminita L Frost
- Department of Biochemistry and Microbiology, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa.
| | - Zenixole R Tshentu
- Department of Chemistry, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa.
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8
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Chitrapriya N, Wang W, Jang YJ, Kim SK, Kim JH. Ligand effect and cooperative role of metal ions on the DNA cleavage efficiency of mono and binuclear Cu(II) macrocyclic ligands complexes. J Inorg Biochem 2014; 140:153-9. [PMID: 25108187 DOI: 10.1016/j.jinorgbio.2014.06.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 06/27/2014] [Accepted: 06/27/2014] [Indexed: 11/24/2022]
Abstract
Two binuclear Cu(II) complexes of N-functionalized macrocycle ligands, namely 1,3-bis(1,4,7-triaza-1-cyclonomyl)propane and 1-(3-(1,4,7-triazonan-1-yl)propyl)-1,4,7,10-tetraazacyclo-dodecane, were synthesized and their ability to hydrolyze the cleavage of supercoiled plasmid DNA (pBR322) was compared with that of structurally related non-functionalized mononuclear Cu(II) complexes. The former, binuclear Cu(II) complex with the symmetrical ligand exhibited enhanced double-strand cleavage activity compared to the other three complexes at the same [Cu(2+)] concentration. In contrast, the latter binuclear complex with unsymmetrical macrocylic ligand did not give rise to double-strand DNA cleavage. The linear DNA formation induced by the mononuclear Cu(II) 1,4,7,10-tetraazacyclo-dodecane complex was realized via a non-random double-stranded scission process. The differential cleavage activity is discussed in relation to dimer formation, effective cooperation and coordination environment of the metal center. The hydrolytic cleavage by the copper complexes without H2O2 is supported by evidence from an anaerobic reaction, free radical quenching, and nitro blue tetrazolium assay. In contrast, both the binuclear complexes cleaved supercoiled DNA efficiently to Form III (linearized DNA) in the presence of H2O2, indicating that nuclearity is a crucial parameter in oxidative cleavage. The radical scavenger inhibition study and nitro blue tetrazolium assay suggested the involvement of H2O2 and superoxide ions in the oxidative cleavage of DNA by the binuclear complexes.
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Affiliation(s)
- Nataraj Chitrapriya
- Department of Chemistry, Yeungnam University, Gyeongsan City, Gyeong-buk 712-749, Republic of Korea
| | - Wei Wang
- Department of Chemistry, Yeungnam University, Gyeongsan City, Gyeong-buk 712-749, Republic of Korea
| | - Yoon Jung Jang
- Department of Chemistry, Yeungnam University, Gyeongsan City, Gyeong-buk 712-749, Republic of Korea
| | - Seog K Kim
- Department of Chemistry, Yeungnam University, Gyeongsan City, Gyeong-buk 712-749, Republic of Korea.
| | - Jung Hee Kim
- Department of Chemistry, Sun Moon University, Asan, Chungnam 336-708, Republic of Korea.
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9
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Gajewska MJ, Ching WM, Wen YS, Hung CH. Synthesis, structure, and catecholase activity of bispyrazolylacetate copper(ii) complexes. Dalton Trans 2014; 43:14726-36. [DOI: 10.1039/c4dt01467g] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heteroleptic copper(ii) complexes containing bis(3,5-di-t-butylpyrazol-1-yl)acetate and nitrogen heterocyclic co-ligands identified the influence of co-ligands on the conformation and catecholase-like catalytic activity.
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Affiliation(s)
| | - Wei-Min Ching
- Institute of Chemistry
- Academia Sinica
- Taipei 105, Taiwan
| | - Yuh-Sheng Wen
- Institute of Chemistry
- Academia Sinica
- Taipei 105, Taiwan
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10
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Ionita G, Andronescu C, Giester G, Rompel A. Synthesis and structure of mononuclear Cu(II) complexes containing bis(1-methylimidazol-2-yl)ketone ligands. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.04.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Torres M, Maisse-François A, Bellemin-Laponnaz S. Highly Recyclable Self-Supported Chiral Catalysts for the Enantioselective α-Hydrazination of β-Ketoesters. ChemCatChem 2013. [DOI: 10.1002/cctc.201300395] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Escrivá E, Soto L, Server-Carrió J, Gómez-García CJ, Mínguez Espallargas G, Ruiz N, Sancho A, García-Lozano J, de Arellano CR. A novel coordination polymer with an unusual [3×2] oblique copper(II) grid: [Cu2(HBIMAM)2(C4O4)3(H2O)2]n·2nH2O [BIMAM=bis(imidazol-2-yl)methylaminomethane]. X-ray structure and magnetic characterization. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.03.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Sánchez H, Server-Carrió J, Escrivà E, Soto L, García-Lozano J, Sancho A, de Arellano CR. Mononuclear and binuclear copper(II) complexes with bis(2-imidazolyl)(bis(methoxycarbonyl)methylmethane) (BIBM), a tripodal bis(imidazole) based ligand. Synthesis, crystal structure and magnetic Characterization of [Cu(BIBM)2](ClO4)2 and [{Cu(BIBM)(H2O)}2(μ1,2,3,4-C2O4)](C4O4)·6H2O. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.11.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Bakshi R, Rossi M, Caruso F, Mathur P. Copper(II) complexes of a new N-picolylated bis benzimidazolyl diamide ligand: Synthesis, crystal structure and catechol oxidase studies. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.06.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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15
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A density functional theory study of multioxomolybdenum(VI) compounds [Mo2O6(imi)6] (imi=imidazole) and Mo2O6: Structure, bonding, and properties. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.theochem.2010.04.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Synthesis, spectroscopic properties, structural characterization and electrochemistry of mixed ligand complexes of copper(I) halide with PPh3 and naphthylazoimidazole. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.04.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Gaber M, Hassanein A, Lotfalla A. Synthesis and characterization of Co(II), Ni(II) and Cu(II) complexes involving hydroxy antipyrine azodyes. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.05.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Núñez H, Server-Carrió J, Escrivà E, Soto L, García-Lozano J, Sancho A, Verdejo B, García-España E. Extended structures of copper(II) complexes with 2-di1H-2-imidazolylmethylmalonate (DIMMAL), a versatile bis(imidazole)–bis(carboxylate) ligand: Solution studies, crystal structures and spectroscopic characterization. Polyhedron 2008. [DOI: 10.1016/j.poly.2007.10.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Hu TL, Du WP, Hu BW, Li JR, Bu XH, Cao R. Novel Ag(I) complexes with azole heterocycle ligands bearing acetic acid group: synthesis, characterization and crystal structures. CrystEngComm 2008. [DOI: 10.1039/b801070f] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Shauib NM, Elassar AZA, El-Dissouky A. Synthesis and spectroscopic characterization of copper(II) complexes with the polydentate chelating ligand 4,4'-[1,4-phenylenedi(nitrilo)dipente-2-one. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 63:714-22. [PMID: 16024272 DOI: 10.1016/j.saa.2005.06.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Revised: 06/12/2005] [Accepted: 06/13/2005] [Indexed: 05/03/2023]
Abstract
A new series of complexes of 4,4'-[1,4-phenylenenedi(nitilo)]dipenten-2-one, (H(2)L) with CuX(2) x nH(2)O, X = Cl, Br, ClO(4), NO(3) and OAc; n = 1-6 as well as their ethylenediamine adducts have been synthesized and characterized by different physical techniques. The formulation of the complexes is assumed based on their elemental analysis and the molar conductivity. The products are found to be pH-dependent. The IR data showed that the ligand acts as dibasic tetradentate coordinated to copper(II) ions through the enolato-oxygen and the azomethine nitrogen atoms. Electronic, ESR spectra and room temperature magnetic moments indicate that complexes 1-9 are square planar while complexes 10 and 11 are square based pyramidal. The different electronic spectral and ESR parameters are calculated and used to describe the nature of ligand-metal bonding (sigma and pi) as well as to estimate the extent of distortion. A macrocyclic containing copper(II) complex, 12 have been isolated by the reaction of Schiff-base with copper(II)-ethylenediamine mixture. The ligand (H(2)L) is designed as a building block for larger molecules and superamolecular assemblies.
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Affiliation(s)
- Nadia M Shauib
- Chemistry Department, Faculty of Science, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait
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21
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Núñez H, Soto L, Server-Carrió J, García-Lozano J, Sancho A, Acerete R, Escrivà E. Structural, Magnetic, and Spectroscopic Comparative Studies on Four New Derivatives of DIMMAL (2-Di1H-2-imidazolylmethylmalonate): A Novel Generator of Multidimensional Networks. Inorg Chem 2005; 44:4644-55. [PMID: 15962973 DOI: 10.1021/ic048234x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper reports the synthesis, structure solution, and magnetic characterization of four new DIMMAL-containing compounds (H2DIMMAL = 2-di1H-2-imidazolylmethylmalonic acid), H2DIMMAL x H2O (1), Na2(DIMMAL) x 5H2O (2), [Cu(HDIMMAL)2] (3), and [Cu2(DIMMAL)2(H2O)2] x 2H2O (4). Compound 1, containing two carboxylates and two protonated imidazole rings, adopts the dizwitterion configuration. These monohydrate MBBs pack together into a 3D array driven, as in the other three cases herein reported, by a combination of multiple-path H-bonds and aromatic-aromatic interactions. Compound 2 consists of centrosymmetric Na+ tetramers in which four NaO6 distorted octahedra are interconnected by carboxylate and water bridges. Compound 3 consists of mononuclear [Cu(HDIMMAL)2] units in which HDIMMAL- acts as a tridentate ligand through two imidazole N atoms and the deprotonated O from a carboxylate. Compound 4 consists of centrosymmetric cyclic dinuclear [Cu2(DIMMAL)2(H2O)2] x 2H2O units involving propionate-arm bridges. The building-block units described above, in each case, are interconnected into 3D networks by multiple H-bonding paths and aromatic-aromatic interactions. The EPR spectra are indicative of an essentially d(x2-y2) ground state for the copper(II) ions in 3 and 4 (CuN4O2 and CuN2O2O' chromophores, respectively). Magnetic susceptibility measurements in the range of 1.8-200 K for compound 4 show weak antiferromagnetic exchange between the copper(II) ions (2J = -1.6(1) cm(-1)). The effectiveness of the propionate-arm bridges, involving C-C sigma bonds, in propagating magnetic exchange between the copper(II) ions is discussed.
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Affiliation(s)
- Hugo Núñez
- Departament de Química Inorgànica, Universitat de València, c/Vicent Andrés Estellés, s/n, 46100 Burjassot (València), Spain
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22
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Ray U, Banerjee D, Chantrapromma S, Fun HK, Lin JN, Lu TH, Sinha C. Cobalt(II)–azoimidazole complexes: Structures of [Co(MeaaiMe)4](ClO4)2·H2O and [Co(HaaiMe)2(NCS)2] (MeaaiMe=1-methyl-2-(p-tolylazo)imidazole; HaaiMe=1-methyl-2-(phenylazo)imidazole). Polyhedron 2005. [DOI: 10.1016/j.poly.2005.02.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Bruijnincx PCA, Lutz M, Spek, AL, van Faassen EE, Weckhuysen BM, van Koten G, Klein Gebbink RJM. Bis(1-methylimidazol-2-yl)propionates and Bis(1-methylbenzimidazol-2-yl)-propionates: A New Family of BiomimeticN,N,OLigands - Synthesis, Structures and CuII Coordination Complexes. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400830] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Utschig LM, Astashkin AV, Raitsimring AM, Thurnauer MC, Poluektov OG. Pulsed EPR/ENDOR Characterization of the Cu2+ Surface Site in Photosynthetic Bacterial Reaction Centers. J Phys Chem B 2004. [DOI: 10.1021/jp037730o] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- L. M. Utschig
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - A. V. Astashkin
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - A. M. Raitsimring
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - M. C. Thurnauer
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - O. G. Poluektov
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
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25
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Abuskhuna S, McCann M, Briody J, Devereux M, McKee V. Synthesis and structure of Mn(II), Cu(II) and Zn(II) complexes containing bis-imidazole ligands. Polyhedron 2004. [DOI: 10.1016/j.poly.2004.04.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Sénèque O, Campion M, Giorgi M, Le Mest Y, Reinaud O. Funnel Complexes with CoII and NiII: New Probes into the Biomimetic Coordination Ability of the Calix[6]arene-Based Tris(imidazole) System. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300798] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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27
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Abuskhuna S, Briody J, McCann M, Devereux M, Kavanagh K, Fontecha JB, McKee V. Synthesis, structure and anti-fungal activity of dimeric Ag(I) complexes containing bis-imidazole ligands. Polyhedron 2004. [DOI: 10.1016/j.poly.2004.02.006] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Silver(I) complexes of the naphthyl-azoimine function: single crystal X-ray structure of bis-[1-ethyl-2-(naphthyl-α-azo)imidazole]silver(I) perchlorate. Polyhedron 2004. [DOI: 10.1016/j.poly.2003.11.056] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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29
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Song Y, Gamez P, Stassen A, Lutz M, Spek A, Reedijk J. Structure and Magnetism of a New Dodecanuclear CuII Complex with Acetato and Imidazolato Bridges, Formed by Oxidation of the Chelating Ligand 1,1,7,7-Tetrakis(imidazol-2-yl)-2,6-diazaheptane. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200300468] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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Chand B, Ray U, Cheng J, Lu TH, Sinha C. Studies on the zinc(II)-azoimine system. Single-crystal X-ray structure of Zn(MeaaiMe)Cl2·H2O and Zn(HaaiMe)2(NCS)2 (MeaaiMe=1-methyl-2-(p-tolylazo)imidazole, HaaiMe=1-methyl-2-(phenylazo) imidazole). Polyhedron 2003. [DOI: 10.1016/s0277-5387(03)00111-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Chauvin AS, Frapart YM, Vaissermann J, Donnadieu B, Tuchagues JP, Chottard JC, Li Y. Synthesis, X-ray crystal structure, and redox and electronic properties of iron(III)-polyimidazole complexes relevant to the metal sites of iron proteins. Inorg Chem 2003; 42:1895-900. [PMID: 12639122 DOI: 10.1021/ic020401a] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new tripod N(3) ligand (L), containing three imidazole rings, was synthesized in good yield. At variance with usual aromatic ligands with N(2) or N(3) donor sets such as pyridine or pyrazole derivatives, L stabilizes the Fe(III) oxidation state. The corresponding iron(III) complexes [Fe(L)Cl(3)] (1) and [Fe(L)(2)](ClO(4))(3) (2) were prepared and characterized by X-ray structural analysis and spectroscopic methods. The coordination environment around all the Fe(III) centers has a distorted octahedral geometry. [Fe(L)Cl(3)] (1) belongs to the monoclinic system, space group P2(1)/n, a = 9.7406(5) A, b = 17.207(2) A, c = 14.615(2) A, beta = 104.448(9)(o) Z = 4, V = 2372.1(4) A(3); R = 0.044, R(w) = 0.055. [Fe(L)(2)](ClO(4))(3) (2) belongs to the monoclinic system, space group P2(1)/c, a = 16.1057(15) A, b = 11.1079(12) A, c = 26.283(2) A, beta = 102.062(10)(o), Z = 4, V = 4598.2(8) A(3); R = 0.0465, R(w) = 0.0902. The Fe-N((i)PrIm) bond lengths are systematically longer than the Fe-N(MeIm) ones. Compound 2 is a highly anisotropic low-spin Fe(III) complex displaying a rather unusual EPR spectrum with a sharp signal at g = 3.5 and a broad one at g approximately 1.6. The fitting of this EPR spectrum is discussed.
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Affiliation(s)
- Anne-Sophie Chauvin
- Laboratoire de chimie et biochimie pharmacologiques et toxicologiques (CNRS UMR8601), Université René Descartes, 45, rue des Saints Pères, 75270 Paris Cedex 06, France
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Copper(II) Oxyanion Complexes Derived from Sparteine Copper(II) Dinitrate: Synthesis and Characterization of 4- and 5-Coordinate Copper(II) Complexes. B KOREAN CHEM SOC 2002. [DOI: 10.5012/bkcs.2002.23.3.404] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Rüther T, Cavell KJ, Braussaud NC, Skelton BW, White AH. Synthesis, characterisation and catalytic behaviour of a novel class of chromium(iii) and vanadium(iii) complexes containing bi- and tri-dentate imidazole chelating ligands: a comparative study. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b207248c] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Jancsó A, Török I, Korecz L, Rockenbauer A, Gajda T. Metal ion co-ordination of a tripodal imidazole-derivative and its tridentate constituent: equilibrium and structural studies. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b111275a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Akhriff Y, Server-Carrió J, Sancho A, García-Lozano J, Escrivá E, Soto L. Two polymeric compounds built from mononuclear and tetrameric squarate-copper(II) complexes by deprotonation of 3,3-bis(2-imidazolyl)propionic acid (HBIP). Synthesis, crystal structure, and magnetic characterization of [Cu(HBIP)(BIP)](C(4)O(4))(1/2).2H(2)O and [[Cu(BIP)(OH(2))](4)(mu-C(4)O(4))](ClO(4))(2).4H(2)O. Inorg Chem 2001; 40:6832-40. [PMID: 11735498 DOI: 10.1021/ic0106571] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two polynuclear copper(II)-squarate compounds of formulas [Cu(HBIP)(BIP)](C(4)O(4))(1/2).2H(2)O (1) and [[Cu(BIP)(OH(2))](4)(mu-C(4)O(4))](ClO(4))(2).4H(2)O (2) (HBIP = 3,3-bis(2-imidazolyl)propionic acid) have been synthesized and characterized by single-crystal X-ray diffraction. Both compounds crystallize in the triclinic system, space group P1, with a =7.947(1) A, b =12.327(4) A, c = 13.150(3) A, alpha = 113.91(2) degrees, beta = 99.85(2) degrees, gamma = 90.02(2) degrees for compound 1 and a = 8.010(1) A, b = 13.073(1) A, c = 14.561(1) A, alpha = 72.13(1) degrees, beta = 80.14(1) degrees, gamma = 84.02(1) degrees for compound 2. The structure of compound 1 can be viewed as made up of [Cu(HBIP)(BIP)] units linked together by the BIP carboxylate groups to form a one-dimensional chain structure along the a axis in the crystal. The copper ion is five-coordinated (CuN(4)O chromophore) with BIP and HBIP acting as tridentate and bidentate ligands, respectively. The coordination geometry is intermediate between SP and TBP. The structure of compound 2 is made of infinite chains built from cationic tetranuclear [[Cu(BIP)(OH(2))](4)(mu-C(4)O(4))](2+) complex units, two uncoordinated perchlorate anions, and four water molecules of crystallization. The squarato group bridges the copper(II) ions, while BIP acts as a tridentate ligand, connecting through its carboxylate group the tetrameric units along the a axis. The two crystallographically independent copper(II) ions are pentacoordinated within a distorted square-based pyramid. Electronic and EPR spectra are consistent with the crystallographic data. Both compounds follow a Curie-Weiss law with very low values of theta (-0.13 and +0.12 K). In compound 2, the weak ferromagnetism interaction is discussed on the basis of the structural features and correlated with published magnetostructural data on similar squarato-bridged copper(II) compounds.
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Affiliation(s)
- Y Akhriff
- Departament de Química Inorgànica, Universitat de València, c/Vicent Andrés Estellés, s/n, 46100 Burjassot, València, Spain
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Rüther T, Done MC, Cavell KJ, Peacock EJ, Skelton BW, White AH. Novel Methylpalladium(II) Complexes Bearing Tridentate Imidazole-Based Chelate Ligands: Synthesis, Structural Characterization, and Reactivity. Organometallics 2001. [DOI: 10.1021/om0104363] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas Rüther
- School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania 7001, Australia, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff CF10 3BT, Wales, U.K., Central Science Laboratory (CSL), University of Tasmania, GPO Box 252-74, Hobart, Tasmania 7001, Australia, and Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia
| | - Melanie C. Done
- School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania 7001, Australia, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff CF10 3BT, Wales, U.K., Central Science Laboratory (CSL), University of Tasmania, GPO Box 252-74, Hobart, Tasmania 7001, Australia, and Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia
| | - Kingsley J. Cavell
- School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania 7001, Australia, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff CF10 3BT, Wales, U.K., Central Science Laboratory (CSL), University of Tasmania, GPO Box 252-74, Hobart, Tasmania 7001, Australia, and Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia
| | - Evan J. Peacock
- School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania 7001, Australia, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff CF10 3BT, Wales, U.K., Central Science Laboratory (CSL), University of Tasmania, GPO Box 252-74, Hobart, Tasmania 7001, Australia, and Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia
| | - Brian W. Skelton
- School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania 7001, Australia, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff CF10 3BT, Wales, U.K., Central Science Laboratory (CSL), University of Tasmania, GPO Box 252-74, Hobart, Tasmania 7001, Australia, and Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia
| | - Allan H. White
- School of Chemistry, University of Tasmania, GPO Box 252-75, Hobart, Tasmania 7001, Australia, Department of Chemistry, Cardiff University, P.O. Box 912, Cardiff CF10 3BT, Wales, U.K., Central Science Laboratory (CSL), University of Tasmania, GPO Box 252-74, Hobart, Tasmania 7001, Australia, and Department of Chemistry, University of Western Australia, Nedlands, Western Australia 6907, Australia
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Abstract
Pulsed electron paramagnetic resonance (EPR) methods such as ESEEM, PELDOR, relaxation time measurements, transient EPR, high-field/high-frequency EPR, and pulsed ENDOR, have been used successfully to investigate the local structure and dynamics of paramagnetic centers in biological samples. These methods allow different contributions to the EPR spectra to be distinguished and can help unravel complicated EPR spectra consisting of overlapping resonance lines, as are often found in disordered protein samples. The basic principles, specific potentials, technical requirements, and limitations of these advanced EPR techniques will be reviewed together with recent applications to metal centers, organic radicals, and spin labels in proteins.
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Affiliation(s)
- T Prisner
- Institute for Physical and Theoretical Chemistry, J. W. Goethe-University Frankfurt, Marie-Curie-Strasse 11, Frankfurt am Main, D-60439 Germany.
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Utschig LM, Poluektov O, Schlesselman SL, Thurnauer MC, Tiede DM. Cu2+ Site in Photosynthetic Bacterial Reaction Centers from Rhodobacter sphaeroides, Rhodobacter capsulatus, and Rhodopseudomonas viridis. Biochemistry 2001; 40:6132-41. [PMID: 11352751 DOI: 10.1021/bi0029191] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction of metal ions with isolated photosynthetic reaction centers (RCs) from the purple bacteria Rhodobacter sphaeroides, Rhodobacter capsulatus, and Rhodopseudomonas viridis has been investigated with transient optical and magnetic resonance techniques. In RCs from all species, the electrochromic response of the bacteriopheophytin cofactors associated with Q(A)(-)Q(B) --> Q(A)Q(B)(-) electron transfer is slowed in the presence of Cu(2+). This slowing is similar to the metal ion effect observed for RCs from Rb. sphaeroides where Zn(2+) was bound to a specific site on the surface of the RC [Utschig et al. (1998) Biochemistry 37, 8278]. The coordination environments of the Cu(2+) sites were probed with electron paramagnetic resonance (EPR) spectroscopy, providing the first direct spectroscopic evidence for the existence of a second metal site in RCs from Rb. capsulatus and Rps. viridis. In the dark, RCs with Cu(2+) bound to the surface exhibit axially symmetric EPR spectra. Electron spin echo envelope modulation (ESEEM) spectral results indicate multiple weakly hyperfine coupled (14)N nuclei in close proximity to Cu(2+). These ESEEM spectra resemble those observed for Cu(2+) RCs from Rb. sphaeroides [Utschig et al. (2000) Biochemistry 39, 2961] and indicate that two or more histidines ligate the Cu(2+) at the surface site in each RC. Thus, RCs from Rb. sphaeroides, Rb. capsulatus, and Rps. viridis each have a structurally analogous Cu(2+) binding site that is involved in modulating the Q(A)(-)Q(B) --> Q(A)Q(B)(-) electron-transfer process. Inspection of the Rps. viridis crystal structure reveals four potential histidine ligands from three different subunits (M16, H178, H72, and L211) located beneath the Q(B) binding pocket. The location of these histidines is surprisingly similar to the grouping of four histidine residues (H68, H126, H128, and L211) observed in the Rb. sphaeroides RC crystal structure. Further elucidation of these Cu(2+) sites will provide a means to investigate localized proton entry into the RCs of Rb. capsulatus and Rps. viridis as well as locate a site of protein motions coupled with electron transfer.
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Affiliation(s)
- L M Utschig
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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Novel cationic and neutral Pd(II) complexes bearing imidazole based chelate ligands: synthesis, structural characterisation and catalytic behaviour. J Organomet Chem 2000. [DOI: 10.1016/s0022-328x(00)00227-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Utschig LM, Poluektov O, Tiede DM, Thurnauer MC. EPR investigation of Cu2+-substituted photosynthetic bacterial reaction centers: evidence for histidine ligation at the surface metal site. Biochemistry 2000; 39:2961-9. [PMID: 10715116 DOI: 10.1021/bi991800t] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The coordination environments of two distinct metal sites on the bacterial photosynthetic reaction center (RC) protein were probed with pulsed electron paramagnetic resonance (EPR) spectroscopy. For these studies, Cu2+ was bound specifically to a surface site on native Fe2+-containing RCs from Rhodobacter sphaeroides R-26 and to the native non-heme Fe site in biochemically Fe-removed RCs. The cw and pulsed EPR results clearly indicate two spectroscopically different Cu2+ environments. In the dark, the RCs with Cu2+ bound to the surface site exhibit an axially symmetric EPR spectrum with g(parallel) = 2.24, A(parallel) = 160 G, g(perpendicular) = 2.06, whereas the values g(parallel) = 2.31, A(parallel) = 143 G, and g(perpendicular) = 2.07 were observed when Cu(2+) was substituted in the Fe site. Examination of the light-induced spectral changes indicate that the surface Cu2+ is at least 23 A removed from the primary donor (P+) and reduced quinone acceptor (QA-). Electron spin-echo envelope modulation (ESEEM) spectra of these Cu-RC proteins have been obtained and provide the first direct solution structural information about the ligands in the surface metal site. From these pulsed EPR experiments, modulations were observed that are consistent with multiple weakly hyperfine coupled 14N nuclei in close proximity to Cu2+, indicating that two or more histidines ligate the Cu2+ at the surface site. Thus, metal and EPR analyses confirm that we have developed reliable methods for stoichiometrically and specifically binding Cu2+ to a surface site that is distinct from the well characterized Fe site and support the view that Cu2+ is bound at or near the Zn site that modulates electron transfer between the quinones QA and QB (QA-QB --> QAQB-) (Utschig, L. M., Ohigashi, Y., Thurnauer, M. C., and Tiede, D. M (1998) Biochemistry 37, 8278-8281) and proton uptake by QB- (Paddock, M. L., Graige, M. S., Feher, G., and Okamura, M. Y. (1999) Proc. Natl. Acad. Sci. U.S.A. 96, 6183-6188). Detailed EPR spectroscopic characterization of these Cu2+-RCs will provide a means to investigate the role of local protein environments in modulating electron and proton transfer.
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Affiliation(s)
- L M Utschig
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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