Studies on Mn(II) and Mn(IV) Complexes of an Unsymmetrical Bidentate Donor, N(4-Chlorophenyl)-Pyridine-2-Aldimine (ClL): Crystal Structure of [Mn(ClL)2(NCS)2]

The synthesis, characterisation and X-ray structure of an Mn(II) compound, [Mn(ClL)2(NCS)2], is described. Oxidation of the compound by H2O2 leads to a mononuclear Mn(IV) compound [Mn(ClL)(ClL')(NCS)2]ClO4·2H2O where one of the ClL ligands is oxidised to the corresponding amide ClL'. Oxidation of [Mn(ClL)2(NCS)2] by Ce(IV), however, leads to a binuclear Mn(IV) compound [Mn2O(ClL')3(ClL)(H2O)2](NCS)2ClO4·2MeCN. Electron transfer behaviour of the compounds was investigated by cyclic voltammetry and differential pulse voltammetry.