US EPA

1535135 

Journal Article 

Octahedral Complexes of Cobalt(III) and Nickel(II) Incorporating with Unsymmetrical NNO-Donor Hydrazone Ligand: Synthesis and Structural Aspects 

Datta, A; Huang, J; Machura, B 

2012 

Yes 

Journal of Chemical Crystallography
ISSN: 1074-1542
EISSN: 1572-8854 

42 

7 

691-696 

10.1007/s10870-012-0301-1 

WOS:000305563100007 

Two new octahedral cobalt(III) and nickel(II) complexes,
[CoL2]center dot ClO4 (1) and [NiL2]center dot H2O center dot NO3 (2) containing the potentially
tridentate Schiff base like hydrazone ligand, N'-[1-(pyridin-2-yl)ethylidene]acetohydrazide (L)
(1:1 condensation product of acetichydrazide and 2-acetylpyridine) were synthesized and
characterized by spectral a well as thermal analysis and single crystal X-ray diffractometry.
Structural investigation shows that in both complexes, the central Co or Ni atom belongs into
N4O2 coordination sphere, developed with the NNO donor sets of two independently hydrazone units.
The corresponding M-N(pyridine) bonds being significantly longer than the M-N(imino) bonds, Co1-
N1 and Co1-N4 [1.934(3) and 1.926(3) ] for 1 and Ni1-N1 and Ni1-N4 [2.076(3) and 2.085(3) ] for
2, Co1-N2 and Co1-N5 [1.846(3) and 1.854(3) ] for 1 and Ni1-N2 and Ni1-N5 [2.001(3) and 1.972(3)
] for 2 respectively. Two new octahedral cobalt(III) and nickel(II) complexes containing the
potentially tridentate hydrazone ligand, N'-[1-(pyridin-2-yl)ethylidene]acetohydrazide (L) were
synthesized and characterized by IR and UV-Vis spectra as well as thermal analysis and single
crystal X-ray diffractometry. 

Cobalt(III); Nickel(II); Hydrazone; Spectral properties; Crystal structure