Super reduced Fe4S4 cluster of Balch's dithiolene series.
Dalton Trans
; 41(12): 3536-40, 2012 Mar 28.
Article
en En
| MEDLINE
| ID: mdl-22314336
ABSTRACT
A super reduced Fe(4)S(4) cluster with a sulfur based radical, [NBu(4)](4)[Fe(3)(III)Fe(II)(µ(3)-S)(4)(mnt)(3)(6-)(mnt)(1-)Ë](4-)Ë, (1) (mnt, maleonitrile dithiolate) which evolves H(2)S gas on treatment with acid under ambient conditions has been synthesized and structurally characterized. The Fe-S distances in 1 are in the range 2.246-2.383 Å, in stark contrast to that of the known n = -2 member of the series based on the [Fe(4)(µ(3)-S)(4)(S(2)C(2)R(2))(4)](n) unit (R = CF(3), Ph) with Fe-S bond lengths of 2.149-2.186 Å. The EPR of 1 displays very weak signals at g, 4.03 and 2.38 along with a strong S-based radical EPR signal at g, 2.003 associated with five structured components tentatively assigned to hyperfine interaction arising out of the naturally abundant (57)Fe with = 88 G. The EPR profile resembles the reduced Fe-S cluster of CO inhibited Clostridium pasteurianum W5 hydrogenase or the Fe(4)S(4) centers of wild-type enzyme, IspH treated with HMBPP or IPP.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Compuestos Organometálicos
/
Compuestos de Sulfhidrilo
/
Compuestos Ferrosos
/
Proteínas Hierro-Azufre
Idioma:
En
Revista:
Dalton Trans
Asunto de la revista:
QUIMICA
Año:
2012
Tipo del documento:
Article
País de afiliación:
India