14 mixed Co(III) dioximine chelates of the types [Co(DioxH)2(amine)2]X (X = Br, I, NO3, ClO4) and H[Co(DioxH)2(N3)2], respectively (DioxH2-1,2-cyclohexane dione dioxime (nyoxime), 1,2-cycloheptane dione dioxime (heptoxime) 1,2-cyclooctane dione dioxime (octoxime)
were obtained and their thermal decompositions were studied in an argon atmosphere. After the dehydration of the crystallohydrates,
both types of complexes exhibit 3 decomposition stages. For the [Co(DioxH)2(amine)2]X type complexes (X = Br, I) the first endothermal stage is the substitution of an amine molecule for the external sphere
anion and this process is followed by two exothermal decomposition stages. With H[Co(DioxH)2(N3)2] type complexes the first and third processes are relatively slow, but the second process is very fast, corresponding to
a vertical portion of the TG curves. From the TG curves kinetic parameters were derived for 11 processes and the validity
of a non-linear compensation law was observed.