Synthesis, Structural Studies and Biological Activity
of Dioxomolybdenum(VI), Dioxotungsten(VI), Thorium(IV)
and Dioxouranium(VI) Complexes with 2-Hydroxy-5-methyl
and 2-Hydroxy-5-chloroacetophenone Benzoylhydrazone¹

A. R. Yaul, V. V. Dhande, S. G. Bhadange, and A. S. Aswar

Department of Chemistry, Sant Gadge Baba Amravati University, Amravati-444602, India

e-mail: aswar2341@rediffmail.com

Received September 15, 2009

Abstract—New complexes of MoO₂(VI), WO₂(VI), Th(IV) and UO₂(VI) with aroyl hydrazones have been pre-
pared and characterized by various physicochemical methods. Elemental analysis suggested 1 : 1 metal : ligand
stoichiometry for MoO₂(VI), WO₂(VI), and UO₂(VI) complexes whereas 1 : 2 for Th(VI) complexes. The phys-
icochemical studies showed that MoO₂(VI), Th(IV) and UO₂(VI) complexes are octahedral. The electrical con-
ductivity of these complexes lies in the range 1.00 10^–7–3.37 10^{–11 –1} cm^–1 at 373 K. The complexes were
found to be quite stable and decomposition of the complexes ended with respective metal oxide as a final product.
The thermal dehydration and decomposition of these complexes were studied kinetically using both Coats–Redfern
and Horowitz–Metzger methods. It was found that the thermal decomposition of the complexes follow first order
kinetics. The thermodynamic parameters of the decomposition are also reported. The biological activities of ligands
and their metal complexes were tested against various microorganisms.

DOI: 10.1134/S0036023611040280

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