| Synthesis, structure and catecholase activity of dinuclear copper and zinc complexes with an N(3)-ligand. | |
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MedLine Citation:
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PMID: 12121775 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The preparation and characterization of dinuclear [M(II)(dbcat)(idpa)](2) (M[double bond]Zn (1), Cu (3); dbcat[double bond]3,5-di-tert-butylcatecholate; idpa[double bond]3,3'-iminobis(N,N-dimethylpropylamine)) complexes are described. Crystallographic characterization of the complex [Cu(II)(dbcat)(idpa)](2) has shown that the co-ordination geometry around copper(II) ions is distorted square pyramidal (triclinic, P-1, a=10.576(1) A, b=11.927(1) A, c=12.621(1) A, alpha=77.89(1) degrees, beta=88.65(1) degrees, gamma=70.21(1) degrees, V=1462.7(2) A(3), Z=2, R=0.0387). Both 1 and 3 were suitable catalysts for the catalytic oxidation of dbcatH(2) to dtbq (dtbq=3,5-di-tert-butyl-1,2-benzoquinone) with dioxygen at ambient conditions in good yields. However, on the basis of kinetic studies the copper- and zinc-catalyzed reactions showed different mechanisms. In the first case valence tautomerism [Cu(II)(dbcat)(idpa)]<==>[Cu(I)(dbsq)(idpa)] precedes the reaction with O(2), while with the zinc complex metal-bound catecholate reacts directly with O(2) with the formation of free superoxide anion. |
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Authors:
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József Kaizer; József Pap; Gábor Speier; László Párkányi; László Korecz; Antal Rockenbauer |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of inorganic biochemistry Volume: 91 ISSN: 0162-0134 ISO Abbreviation: J. Inorg. Biochem. Publication Date: 2002 Jul |
Date Detail:
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Created Date: 2002-07-17 Completed Date: 2002-10-22 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7905788 Medline TA: J Inorg Biochem Country: United States |
Other Details:
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Languages: eng Pagination: 190-8 Citation Subset: IM |
Affiliation:
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Research Group for Petrochemistry, Hungarian Academy of Sciences, 8201 Veszprém, Hungary. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Catechols
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chemistry*,
metabolism Copper / chemistry* Crystallography, X-Ray Electron Spin Resonance Spectroscopy Molecular Structure Oxidation-Reduction Oxidoreductases / chemistry*, metabolism Solutions Zinc / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Catechols; 0/Solutions; 7440-50-8/Copper; 7440-66-6/Zinc; EC 1.-/Oxidoreductases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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