Synthesis, characterization, electrochemical and magnetic study of mixed ligand mono iron and O-methoxy bridged diiron complexes

The complexes cis-[Fe(5,5′-dmbipy)2Cl2]Cl and cis-[Fe(5,5′-dmbipy)2Cl2]ClO4 (5,5′-dmbipy is 5,5′-dimethyl-2,2′-bipyridine) were synthesized as precursors of new diiron complexes. The diiron complex [Fe(5,5′-dmbipy)(NCS)2(μ-OCH3)]2 was obtained from the reaction of KSCN with cis-[Fe(5,5′-dmbipy)2Cl2]Cl and cis-[Fe(5,5′-dmbipy)2Cl2]ClO4. Complex [Fe(5,5′-dmbipy)(NCS)2(μ-OCH3)]2 was obtained from the addition of KSCN to FeCl2·4H2O and then 5,5′-dmbipy. A new binuclear iron(III) complex [Fe(4bt)(NCS)2(μ-OCH3)]2 (4bt is 4,4′-bithiazole) has also been synthesized from the reaction of [Fe(4bt)3](NO3)2 with KSCN in a mixture of methanol/acetonitrile solvent.