Kinetics and Mechanism of Complex Formation by Molybdenum(VI) and Vanadium(V) with Benzo-, o-Methylbenzoand o-Hydroxybenzohydroxamic Acids in Aqueous Solution

Department of Chemistry, Laboratory of Sir Rashbehary Ghose Professor of Chemistry, University College of Science, Calcutta-700 009 Manuscript received 17 November 1993 Kinetics of formation of complexes in the reaction of MoVI at pH 7.5-8.5 and of Vv at pH 2.5-3.5 with benzo-, o-methylbenzo- and o-hydroxybenzohydroxamic acids in aqueous solution have been studied by stopped-flow spectrophotometry. Data have been analysed for evaluation of rate constants and the corresponding activation parameters and plausible reaction mechanisms assigned. The reactions appear to involve associative, Ia , processes with significant dependence on the nature of the entering ligand