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 (C 6 H 4 S 2 ) 2 ] 2- complexes, which cannot be isolated in the solid state. On acidifying, oxidizing with O 2 or heating the solution, the CO ligands are split off; after reduction with NaBH 4 , CO can be co-ordinated again at pH > 7 under normal conditions. Reacting benzene-1-thiomethyl-2-thiol in alkaline medium with Fe 2+ and CO yields the isolable [cis-Fe(CO) 2 (CH 3 S-C 6 H 4 -S) 2 ], which is characterized by elemental analyses, IR, 1 H NMR and mass spectra. It is a labile complex coordinating CO reversibly