Thermal analysis of manganese(II) complexes with glycine

The thermal decomposition behaviour of the manganese(II) complexes with gly cine: Mn(gly)Cl-2(H2O)(2), Mn(gly)(2)Cl-2, Mn(gly)Br-2(H2O)(2), Mn(gly)(2)B r-2(H2O)(2) was investigated by means of TG-DTG-DTA, Hi-Res-TA and DSC tech niques. The evolved gas analysis was carried out by means of the coupled TG -FTIR system. Heating of the complexes results first in the release of wate r molecules. Next, the multi-stage decomposition process with degradation o f glycine ligand occurs. Water, carbon dioxide and ammonia were detected in the gaseous products of the complexes decomposition. The temperature of NH 3 evolution from the complexes is higher than from free glycine. The final residue in the air atmosphere is Mn2O3 which transforms into Mn3O4 at 930 d egreesC. In a nitrogen atmosphere, the complexes decompose into MnO.