KINETIC-STUDIES ON [(MFE3S4(SR)3)2(MU-SR)3]3- (M = MO OR W, R = ET OR PH) - INFLUENCE OF MO OR W ON THE MECHANISM OF SUBSTITUTION AT THE IRON CENTERS WITHIN THE CLUSTER
被引:24
作者:
HENDERSON, RA
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HENDERSON, RA
OGLIEVE, KE
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OGLIEVE, KE
机构:
来源:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
|
1993年
/
10期
关键词:
D O I:
10.1039/dt9930001473
中图分类号:
O61 [无机化学];
学科分类号:
070301 ;
081704 ;
摘要:
Kinetic studies on the acid-catalysed substitution of [{MFe3S4(SR)3}2(mu-SR)3]3- (M = Mo or W, R = Et or Ph) have shown that the heterometal influences the intimate mechanism of substitution at the iron sites. Whereas [Fe4S4(SR)4]n- (n = 2 or 3) react exclusively by a dissociative mechanism, the Mo- or W- containing clusters usually exhibit an additional associative pathway. In addition the heterometal influences the ability of the iron centres to bind a variety of small molecules. The possible relevance of these studies to the binding of substrates by certain metalloenzymes is discussed.