SYNTHESIS AND THERMAL-DECOMPOSITION OF COMPLEXES OF RARE-EARTH BROMIDES WITH ALANINE

The complexes of rare earth bromides with alanine, REBr3. 3Ala . nH(2) O (RE=Ce, Pr, Sm, Eu, Gd and Tb, n=3; RE=Dy and Y, n=2.5 Ala=alanine), were prepared and characterized by means of chemical analysis, elemen tal analysis, molar conductivity, thermogravimetry, IR spectra and X-r ay diffraction. The thermal decomposition in N-2 of these complexes wa s studied by means of TG-DTG techniques from ambient temperature to 10 00 degrees C. During heating, the hydrated complexes of Ce, Pr and Y l ose waters in one step, but the hydrated complexes of Sm, Eu, Gd, Tb a nd Dy lose waters in two steps. Then anhydrous complexes lose 2.5 alan ine molecules except the complexes of Eu which lose three alanine mole cules. Apparently, only the complex of Eu has an intermediate, EuOBr. All complexes finally decompose to oxides.