PREPARATION AND PROPERTIES OF YTTRIUM COMPLEXES WITH ALKANODICARBOXYLIC ACIDS

Malonate, succinate and glutarate of yttrium were obtained by dissolving Y(OH) 3 in a solution of the corresponding acid and crystallization, whereas adipate, pimelate, suberate, azelate and sebacate in the reaction of YCl 3 with the ammonium salt of the acid. Yttrium alkanodicarboxylates were prepared as crystalline solids with general formula Y 2 O 3 .nH 2 O, where n=3, 4, 6, 7. On the basis of IR spectra the way of coordination COO - - Y 3+ was established. Yttrium malonate, succinate, glutarate, azelate and sebacate heated lose crystallization water and next anhydrous complexes are transformed to Y 2 O 3 , whereas yttrium adipate, pimelate and suberate on heating lose some water molecules and, the mono- or dihydrates formed are decomposed to Y 2 O 3 . The properties of the studied complexes change discretely according to odd or even number of carbon atoms in the chain. © 1990 Wiley Heyden Ltd, Chichester and Akadémiai Kiadó, Budapest.