Thermal Analysis of Manganese(II) Complexes With Glycine

The thermal decomposition behaviour of the manganese(II) complexes with glycine: Mn(gly)Cl₂(H₂O)₂, Mn(gly)₂Cl₂, Mn(gly)Br₂(H₂O)₂, Mn(gly)₂Br₂(H₂O)₂ was investigated by means of TG-DTG-DTA, Hi-Res-TA and DSC techniques. 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 water molecules. Next, the multi-stage decomposition process with degradation of glycine ligand occurs. Water, carbon dioxide and ammonia were detected in the gaseous products of the complexes decomposition. The temperature of NH₃ 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°C. In a nitrogen atmosphere, the complexes decompose into MnO. This revised version was published online in August 2006 with corrections to the Cover Date.