Synthesis and spectral studies on Co (II), Ni(II) and Cu(II) complexes with 1,2- bis(N-methylbenzimidazolyl)benzene

Abstract

Reactions of hydrated halides/perchlorate of cobalt(II), nickel(II) and copper(II) with 1,2-bis(N- methylbenzimidazolyl)benzene (L) in stoichiometric amounts in ethanol-teof/acetone/thf produced complexes of the formulae MX2L.nH2O (n = 1, M = Co, X = Cl ; n = 0, M = Co, X = Br or I ; n = 0, M = Ni, X = I ; n = 0, M = Cu, X = Br), (MX2L (H2O)) ( M = Ni, X = Cl or Br ; M = Cu, X = Cl), (Co(OClO3)2(L)1.5)2.2H2O, (Ni(L)2)(ClO4)2.H2O and (Cu(L)2(OClO3))ClO4.2H2O. The complexes were characterised by elemental analyses, thermogravimetric analysis, magnetic moment measurments, IR, electronic, NMR, ESR, mass spectral techniques. Probable structures have been proposed for the complexes. Keywords: 1,2-bis(N-methylbenzimidazolyl)benzene, cobalt, nickel and copper complexes.