Thermal decomposition and IR-spectra of Mg(II) complexes with gamma-picoline

The thermal decomposition of the complexes Mg(Clac)(2)(pic)(2).3H(2)O (I), Mg(Cl(2)ac)(2)(pic).4H(2)O (II) and Mg(Cl(3)ac)(2)(pic)(2).3H(2)O (III), wh ere Clac = ClCH2COO-, Cl(2)ac = Cl2CHCOO-, Cl(3)ac = Cl3CCOO- and pic = gam ma-picoline had been investigated in air by TG and DTA. The possible scheme of destruction of the complexes is suggested. The final product was MgO fo r the complexes I-III. The thermal stability of the complexes can be ordere d in the sequence: I = III < II. IR data suggest a unidentate coordination of carboxylates to Mg(II) in complexes I-III and gamma-picoline coordinatio n with Mg(II) through the nitrogen atom of its heterocyclic ring.