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A DFT investigation on structural and redox properties of a synthetic Fe6S6 assembly closely related to the [FeFe]-hydrogenases active site
- Bruschi, Maurizio (author)
- Greco, Claudio (author)
- Zampella, Giuseppe (author)
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- Pickett, Christopher J. (author)
- De Gioia, Luca (author)
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- (creator_code:org_t)
- Elsevier BV, 2008
- 2008
- English.
- In: Comptes Rendus. Chimie. - : Elsevier BV. - 1631-0748. ; 11:8, s. 834-841
- Journal article (peer-reviewed)
Abstract
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- In the present contribution, a density functional theory (DFT) investigation is described regarding a recently synthesized Fe6S6 complex - see C. Tard, X. Liu, S.K. Ibrahim, M. Bruschi, L. De Gioia, S.C. Davies, X. Yang, L.-S. Wang, G. Sawers, C.J. Pickett, Nature 433 (2005) 610 - that is structurally and functionally related to the [FeFe]-hydrogenases active site (the so-called H-cluster, which includes a binuclear subsite directly involved in catalysis and an Fe4S4 cubane). The analysis of relative stabilities and atomic charges of different isomers evidenced that the structural and redox properties of the synthetic assembly are significantly different from those of the enzyme active site. A comparison between the hexanuclear cluster and simpler synthetic diiron models is also described; the results of such a comparison indicated that the cubane moiety can favour the stabilization of the cluster in a structure closely resembling the H-cluster geometry when the synthetic Fe6S6 complex is in its dianionic state. However, the opposite effect is observed when the synthetic cluster is in its monoanionic form.
Subject headings
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
Keyword
- density
- functional theory
- biomimetic models
- hydrogenase
- bioinorganic chemistry
- iron
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- art (subject category)
- ref (subject category)
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