Thermal oxidative destruction of cobalt(II)phthalocyanines with oxygen containing substituents

Summary

Processes of thermooxidizing destruction of series of oxygen containing cobalt(II)phthalocyanines were studied by thermogravimetry and IR and electronic absorption spectroscopy. These processes have several stages including dehydration, oxidation, desulphonation (decarboxylation) of peripheral substituents of cobalt(II)phthalocyanines, destruction of phthalocyanine macrocycle and oxidation until the highest oxides. The temperature of beginning of the process of thermal oxidative destruction decreases in the following order: Co(4-PhSO₃H)₄Pc>Co(4-COO^-)₄(5-SO^-₃)₄(Ba²⁺)₄Pc>Co(4-Br)₄(5-SO₃H)₄Pc>Co(4-Cl)₄(5-SO₃H)₄Pc>Co(4-COOH)₄(5-SO₃H)₄Pc.