TY - JOUR
T1 - A DFT investigation on structural and redox properties of a synthetic Fe6S6 assembly closely related to the [FeFe]-hydrogenases active site
AU - Bruschi, Maurizio
AU - Greco, Claudio
AU - Zampella, Giuseppe
AU - Ryde, Ulf
AU - Pickett, Christopher
AU - De Gioia, Luca
PY - 2008/6/6
Y1 - 2008/6/6
N2 - 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.
AB - 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.
U2 - 10.1016/j.crci.2008.04.010
DO - 10.1016/j.crci.2008.04.010
M3 - Article
VL - 11
SP - 834
EP - 841
JO - Comptes Rendus Chimie
JF - Comptes Rendus Chimie
SN - 1631-0748
IS - 8
ER -