Octahedral Cu~(II) and Ni~(II) complexes manifesting with N'-[1-(pyridin-2-yl)ethylidene] acetohydrazide: Structural outlooks and spectral characteristics

摘要

A tridentate hydrazone precursor, N'-[1-(pyridin-2-yl)ethylidene]acetohydrazide (L) (1:1 refuxed product of acetichydrazide and 2-acetylpyridine), produced two octahedral Cu~(II) and Ni~(II) derivatives, [CuL2 ]·NO3 (1) and [NiL2 ]·ClO4 ·H2O (2). Both are subjected to X-ray diffraction system, and structural investigation shows that the central metal atom (Cu~(II) or Ni~(II) ) adopts a distor ted octahedral geometry with N4 O2 donor sets by coordination of a pair of independent hydrazone precursors. Besides X-ray study, IR and UV-vis spectra, thermal analysis and room temperature magnetic moments are utilized for establishing signifcant characteristics of both complexes. It is apparent that the M-N_(pyridine) bonds are slightly longer than the M-N_(imino) bonds, Cu1?N1 and Cu1?N4 [2.300(2) and 2.038(2) A] for 1 and Ni1?N1 and Ni1?N4 [2.075(2) and 2.084(1) A] for 2, Cu1?N2 and Cu1?N5 [2.062(1) and 1.932(1) A] for 1 and Ni1?N2 and Ni1?N5 [2.008(2) and 1.975(2) A] for 2, respectively. As per our observation, the effective magnetic moment value (μ_(eff)) is found to be 1.77 B.M. for 1 and 3.06 BM for 2, respectively.