Thermodynamic landscape of the redox-centres in the electron-confurcating [FeFe]-Hydrogenase (HydABC) of Thermotoga maritima

Selenocarboxylato complexes of iron containing heterocyclic group of the general formula CpFe(CO)2SeCO-het [het = 2-C4H3S (1), 2-C4H3O (2), –CH2–2-C4H3S (3)] were prepared from the reaction of iron selenide, (μ-Se)[FeCp(CO)2]2 and the corresponding heterocyclic acid chlorides. These complexes have been characterized by elemental analysis, UV–Vis, IR and 1H NMR spectroscopic techniques. The X-ray structure of 1 is determined and its electrochemical behavior has been described in details applying cyclic voltammetry.