Preparation and properties of Y(III) and lanthanide(III) complexes with pyridine-2,4-dicarboxylic acid

Abstract

The conditions of the formation of Y(III) and lanthanide (III)(LaLu) lutidinates were studied and their compositions and solubilities in water at 293 K were determined (10 −4 mol dm −3). The spectra of the hydrated complexes were recorded and their thermal decomposition in air was determined. During heating, the hydrated lutidinates Ln 2(C 7H 3NO 4) 3·nH 2O ( n = 11–29) lose some or all of their molecules of crystallization water in one (LaNd) or two (Y, SmLu) steps, and then the anhydrous (LaNd, Lu) or hydrated (Y, SmYb) complexes decompose either directly to oxides (Y, Ce, Pr, SmLu) or with intermediate formation of oxocarbonates Ln 2O 2CO 3 (La, Nd).