Über die Koordination von Kohlenmonoxid an Bis(dithiolato)-Eisen-Komplexen [1] / On the Coordination of Carbon Monoxide on Bis(dithiolato)-Iron Complexes [1]

Abstract

The reaction of CO with iron salts in the presence of benzene-dithiol depends on the oxidation state of iron, pH of the solution, temperature and CO pressure. In alkaline EtOH one obtains labile cis-[Fe(CO)2(C6H4S2)2]2- complexes, which cannot be isolated in the solid state. On acidifying, oxidizing with O2 or heating the solution, the CO ligands are split off; after reduction with NaBH4, CO can be co-ordinated again at pH > 7 under normal conditions. Reacting benzene-1-thiomethyl-2-thiol in alkaline medium with Fe2+ and CO yields the isolable [cis-Fe(CO)2(CH3S-C6H4-S)2], which is characterized by elemental analyses, IR, 1H NMR and mass spectra. It is a labile complex coordinating CO reversibly