Thermal behavior of Cu(II), U(VI), Mn(II) and Ni(II) complexes with 2',2"'-(2,6-pyridinediyldiethylidyne)dioxamohydrazide was studied by DSC and TG analysis, in the temperature range of 20-600 degreesC in a stream of nitrogen. Depending on the structure of complexes, thermal degradation occurred mostly in the range of 200-400 degreesC, preceded by a loss of crystal and coordinated solvent if present. Kinetic processes of degradation were studied by analysis of DSC and TG curves recorded at one or more heating rates. Based on activation energies, determined in this way, thermodynamic parameters of activated complexes were also determined for U(VI) and Mn(II) complexes. Mechanisms of,degradation processes were established using the obtained data.