Trifluoro(oxalato)manganate(III) Oxidations of Thiosemicarbazide, Semicarbazide and their Derivatives

Department of Studies in Industrial Chemistry, Kuvempu University, Jnana Sahyadri-577 451

Department of Studies in Chemistry; Mangalore University, Mangalagangotri-574 199

Manuscript received 11 March 1996, revised 30 October /996, accepted 8 February 1997

Potassium trifluoro(oxalato)manganate(III) (E'_o= +1.07 V) is quite stable in the solid state but undergoes decomposition in aqueous solution. The solution stability of the complex in different acid media is studied. The oxidation reactions of potassium triflouro(oxalato manganate(III) with substrates like thiosemicarbazide, thiosemicarbazones, semicarbazide, semicarbazones and metal complexes of thiosemicarbazide have been investigated. The reactions have been followed titrimetrically and also potentiometrically in some cases. The stoichiometries of the reactions are established and the oxidation products identified.