The use of electrochemical methods in the preparation of new manganese(II) complexes of bidentate schiff base ligands and 1,10-phenanthroline: The X-ray crystal structure of 1,10-phenanthroline bis{N-[2-(4-methyl)phenyl]-salicylideneiminato} manganese(II)

Article abstract of DOI:10.1016/0277-5387(95)00363-0

A series of manganese(II) complexes of bidentate NO donor set Schiff base ligands, together with corresponding mixed complexes containing 1,10-phenanthroline (phen), have been prepared by the electrochemical oxidation of a manganese anode in acetonitrile solutions of the Schiff bases (HL) and phen. The complexes formed are found to be of the form [Mn(L)₂] · nH₂O and [Mn(L)₂(phen)] · nH₂O (n = 0-3). The single-crystal X-ray structure of [Mn(L⁶)₂(phen)] (L⁶ = {N-[2-(4-methyl)phenyl]-salicylideneiminato}) reveals it to be a distorted octahedral manganese(II) complex, with the distortion occurring in the equatorial plane. Cyclic voltammetry and room-temperature magnetic studies indicate that the monomeric structure of [Mn(L⁶)₂(phen)] is representative of the whole series of mixed ligand compounds, whilst the magnetic behaviour of the complexes, formulated as [Mn(L)₂] · nH₂O, suggests that they may exist as polymeric species with strong anti-ferromagnetic coupling between the manganese centres. * Authors to whom correspondence should be addressed.