Thermoanalytical investigation of magnesium(II) complexes with pyridine asbio-active ligand

TG, DTA and other analytical methods were applied to investigate the therma l behaviour and structures of the compounds Mg(ClAc)(2)(Py)(2). 2H(2)O (I), Mg(Cl2Ac)(2)(Py). H2O (II), Mg(Cl3Ac)(2)(Py). 6H(2)O (III) and Mg(SCN)(2)( Py)(3). 2H(2)O(IV), where ClAc=ClCH2COO-, Cl2Ac= Cl2CHCOO-, Cl3Ac=Cl3CCOO- and Py=Pyridine. The compositions of the complexes and the solid-state inte rmediates and products of thermolysis were identified by means of elemental analysis. Possible schemes of destruction of the complexes are suggested. The final products of the thermal decompositions were MgO (I-III) and MgS ( IV). The IR data suggest unidentate coordination of the carboxylate ions to Mg(II) in complexes I-III. Py is coordinated to the Mg(II) through the nit rogen atom of its heterocyclic ring.