Thermal decomposition of Mg(II) complexes with ronicol

The thermal decomposition of the complexes Mg(Clac)(2)(ron)(2). 3H(2)O(I), Mg(Cl(2)ac)(2)(ron)(2). 3H(2)O(II) and Mg(Cl(3)ac)(2)(ron)(2). 3H(2)O(III), where Clac=ClCH2COO-, Cl(2)ac=Cl2CHCOO-, Cl(3)ac=Cl3CCOO- and ron=3-pyridy lcarbinol (ronicol) had been investigated in air atmosphere in temperature range 20-1000 degreesC by means of TG and DTA. The composition of the compl exes and the solid state intermediate and resultant products of thermolysis had been identified by means of elemental analysis and complexometric titr ation. The possible scheme of destruction of the complexes is suggested. Th e final product of the thermal decomposition was MgO. The thermal stability of the complexes can be ordered in the sequence: I < III < II. IR data sug gest that ronicol was coordinated to Mg(II) through the nitrogen atom of it s heterocyclic ring.