Carboxy-functionalized dithiolate di-iron complexes related to the active site of Fe-only hydrogenase

Reactions of the di-iron complex [Fe2(μ-S)2(CO)6]2− with carboxy-functionalized dihalide derivatives (XCH2)2R (X = Cl, R = NC6H4CH2CO2CH3; X = Br, R = C6H3COOH, C6H3COON(COCH2)2) gave new functionalized dithiolate di-iron complexes [Fe2(μ-SRS)(CO)6] (R = (CH2)2NC6H4CH2CO2CH3 (1), (CH2)2C6H3COOH (2), (CH2)2C6H3COON(COCH2)2 (3)) in low yields. The azadithiolate complex 1 has been characterized by a single crystal X-ray diffraction analysis and studied by electrochemical methods.