A kinetic study of the osmium(Vlll) catalyzed reduction of octacyanomolyb-date(V) and octacyanotungstate(V) ions by selenium(IV) in an alkaline medium

Abstract The kinetics of the osmium(VIII) catalyzed reduction ofoctacyanomolybdate(V) and octacyanotungstate(V) ions by Se(IV) have been studied in an alkaline medium. The reaction is first order with respect to M(CN) 3− 8 ions (M = Mo, W) and the osmium(Vlll) catalyst. The second order reaction rate constants are 4.30 × 10 3 M − min- −1 and 2.60 × 10 3 M −1 sec −1 at 293 K respectively. A reaction mechanism is proposed.