Abstract
Under nitrogen, an acidified solution of [TiO(C2O4)2]2− or [V(C2O4)3]3− is photolysed by 254 nm radiation, giving the lower-valent cation and CO2, trapped as BaCO3. Quantum yields were determined by uranyl-oxalate actinometry, combined with Ti3+ titration against iron(III) and vanadium(II) determination by MnO4− titration and spectrophotometrically. Values Of oTiIII and oVII in 0.148 M H2SO4 were 0.068 and 0.040, respectively. Both increased with increasing [H2SO4]. oTiIII decreased on reducing the light intensity and was lower than oox. The results are compared with the published works on the photolysis of the oxalato complexes of chromium(III) and manganese(III).
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