Abstract
The reactions of 23 unsaturated N-arylhydroxamic acids with vanadium(V) have been investigated in strong hydrochloric acid media to find more sensitive reagents among the family of hydroxamic acids. This study shows that the vanadium complexes of 9 new reagents have molar absorptivities around 7500 1 mole −1 cm −1. This value is considerably larger than that obtained for the vanadium complex of N-phenylbenzohydroxamic acid (ε=4650). A rapid spectrophotometric method for the determination of vanadium(V) is described, employing the most promising of these reagents, N-phenyl-3-styrylacrylohydroxamic acid. The method is highly selective and tolerates large amounts of diverse ions usually associated with vanadium-bearing materials including iron(III), aluminium(III), chromium(III), nickel(II). cobalt(II), zinc(II) and manganese (II).
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