Thermal decomposition of rare earth complexes with 2-amino-3,5-dichlorobenzoic acid

The conditions of the thermal decomposition of the 2-amino-3, 5-dichlorobenzoates of Y and lanthanides have been studied. During heating in air, the dihydrated complexes Ln(C6H2Cl2NH2COO)(3) . 2H(2)O decompose in three steps, with the exception of the yttrium(III) and cerium(III) complexes, which decompose in two steps. In the first step the complexes lose two molecules of water and next decompose to the oxides with intermediate formation of LaOCl. The complexes of Y(III) and Ce(III), when heated, are dehydrated and then decompose to the oxides. The mode of metal-ligand coordination is discussed.