Mechanism of the thermal decomposition of titanium, vanadium, and chromium oxalates and their complexes with hydrazine.

Abstract

Derivatog. and IR spectra of intermediate decompn. products showed that all decompns. proceeded through carbonate stages (in air or inert atm.). The carbonates obsd. were Ti2(CO3)3, Ti2O2(CO3), Cr2(CO3)3, Cr2O2(CO3), Cr2O(CO3)2, and V2(CO3)3. Metal-oxygen bond strength in these oxalates decreases in the order Ti(III) > V(III) > Cr(III). Only with Cr(III) does N2H4 displace inner sphere C2O42-. Loss of N2H4 is accompanied by both endo- and exothermic effects. [on SciFinder(R)]