A seven membered chelate ring complex of Mn(II) derived from bis(5-phenyl-2H-1,2,4-triazole)-3-yl-disulfane and cleavage of the S-S bond in a Co(II) complex: Synthesis, spectral and structural characterization

Abstract

The reaction of Mn(OAc)2.4H2O with bis(5-phenyl-2H-1,2,4-triazole)-3-yl-disulfane (H2ptds.2H 2O) (1) yielded new complex [Mn(ptds)(o-phen)2] (2). It is observed that under similar conditions the reaction of Co(OAc)2 with H2ptds.2H2O (1) leads to thermolysis of the S-S bond of the disulfane to yield [Co(pts)(o-phen)2].H2O.0.5C 2H5OH, with the newly generated organic ligand 5-phenyl-2H-1,2,4-triazole- 3-sulfinate, (pts)2-. The ligand H 2ptds.2H2O (1), [Mn(ptds)(o-phen)2] (2) and [Co(pts)(o-phen)2]. H2O.0.5C2H5OH (3) crystallized into monoclinic, trigonal and triclinic crystal systems, respectively. The triazole ring nitrogen of the bidentate ligand chelates the Mn(II) center forming a seven membered chelate ring, while N, O donor sites of the resulting triazole sulfinate bond Co(II) to form a five membered chelate. The resulting complexes are paramagnetic and have a distorted octahedral geometry. © 2011 Elsevier Ltd.