Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2012 Vol: 4 Issue: 1

Spectroscopic, Thermal and Powder X-ray diffraction studies of bis-(benzoylacetonato)cobalt(II) and nickel(II) complexes

Abstract

Two Bis-(benzoylacetonato)cobalt(II) and nickel (II) complexes has been synthesized and their characterization has been done on the basis of CHN analyses, IR, UV-Vis, X-ray powder pattern techniques. The cobalt(II) complexes has triclinic crystal system with unit cell dimensions, a = 6.499; b = 5.300; c = 11.327 and α = 86.754; β = 111.279;γ = 98.620, whereas the nickel (II) complex has monoclinic system with a = 12.8142; b = 5.1697; c = 9.2825 and β = 141.849. The thermal decomposition steps of the complexes have been studied by thermogravimetric and differential thermal analyses. Thermodynamic parameters like activation energy (Ea*), ΔH, ΔS and ΔG for each decomposition of the complexes in the solid state were evaluated by following some standard methods and useful conclusions were drawn. The ΔG and ΔS of the systems were found to be negative, indicating the reactions were thermodynamically allowed.