Thermal and magnetic behaviour of 5-chloro-2-nitrobenzoates of Co(II), Ni(II) and Cu(II)

Abstract

Abstact 5-Chloro-2-nitrobenzoates of Co(II), Ni(II) and Cu(II) having formulae Co(C7H3O4NCl)2� 3H2O, Ni(C7H3 O4NCl)2� 3H2O and Cu(C7H3O4NCl)2� 2H2O, were obtained as polycrystalline compounds. From the IR spectra analysis of complexes, sodium salt and according to the spectroscopic criteria the carboxylate ions seem bidentate groups. The complexes of Co(II) and Cu(II) lose the water of crystallization in one step at 363–523 K. The Ni(II) complex loses it in two stages in the ranges of 323–378 and 378– 523 K, respectively. The compounds follow the Curie– Weiss law. The magnetic moment values experimentally determined change from 4.53 to 4.55 lB for Co(II) complex, from 2.34 to 2.97 lB for Ni(II) 5-chloro-2-nitrobenzoate and from 1.80 to 1.90 lB for Cu(II) complex.