Novel Single and Double Diiron Oxadithiolates as Models for the Active Site of [Fe]-Only Hydrogenases

The series of diiron oxadithiolate model
complexes for the active site of [Fe]-only hydrogenases
Fe2(μ-SCH2OCH2S-μ)(CO)6 (1), [Fe2(μ-SCH2OCH2S-μ)(CN)2(CO)4](Et4N)2 (2), [Fe2(μ-SCH2OCH2S-μ)(CN)(CO)5](Et4N) (3), Fe2(μ-SCH2OCH2S-μ)(CO)5[CpFe(CO)2(SPh)]
(4), and [Fe2(μ-SCH2OCH2S-μ) (CO)5]2 [(η5-Ph2PC5H4)2
Fe] (5) have been synthesized and fully characterized by
elemental analysis, spectroscopy, and X-ray diffraction
analysis. The structural features for some of the model
complexes are compared with the corresponding features
for the active site of [Fe]-only hydrogenases.