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
作者:A. Singh、M.K. Bharty、S.K. Kushawaha、R.J. Butcher、N.K. Singh
DOI:10.1016/j.poly.2011.03.050
日期:2011.8
The reaction of Mn(OAc)(2)center dot 4H(2)O with bis(5-phenyl-2H-1,2,4-triazole)-3-yl-disulfane (H(2)ptds center dot 2H(2)O) (1) yielded new complex [Mn(ptds)(o-phen)(2)] (2). It is observed that under similar conditions the reaction of Co(OAc)(2) with H(2)ptds center dot 2H(2)O (1) leads to thermolysis of the S-S bond of the disulfane to yield [Co(pts)(o-phen)(2)]center dot H(2)O center dot 0.5C(2)H(5)OH, with the newly generated organic ligand 5-phenyl-2H-1,2,4-triazole-3-sulfinate, (pts)(2-). The ligand H(2)ptds center dot 2H(2)O (1), [Mn(ptds)(o-phen)(2)] (2) and [Co(pts)(o-phen)(2)]center dot H(2)O center dot 0.5C(2)H(5)OH (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. (C) 2011 Elsevier Ltd. All rights reserved.