Preparation, properties and thermal decomposition of Y(III) and lanthanide(III) pyridine-2, 5-dicarboxylates

Abstract

Abstract The conditions of the formation of Y(III) and lanthanide (III) (LaLu) isocinchomeronates were studied, and their quantitative compositions and solubilities in water at 293 K were determined. The IR spectra of the hydrated complexes were recorded and their thermal decomposition in static air were determined. During heating the hydrated isocinchomeronates Ln2(C7H3NO4)3·nH2O (n = 6−20) lose some (Ce, Pr, DyTm) or all (Y, La, NdTm, Dy, Lu) of their crystallization water molecules in one (Y, La, PrDy, Er, Yb, Lu) or two (Ce, Ho, Tm) steps then the hydrated complexes decompose directly to the oxides (Y, Ce, PrLu) or with intermediate formation of oxocarbonates Ln2O2CO3 (La).