Synthesis and Characterization of Lanthanide(III) and Y(III) Complexes with 2-Hydroxy-3-methyIbenzoic Acid

摘要

The complexes of lanthanides(III) (La-Lu) and Y(III) with 2-hydroxy-3-methylbenzoic acid with a general formula Ln(C_8H_7O_3)_3 centre dot nH_2O,where n=3 for La-Pr;n=4 for Nd -Tm and Y,n=2 for Yb - Lu were prepared and characterized by IR spectroscopy,X-ray diffraction patterns,thermogravimetric studies and solubility.Tri- and tetrahydrates form three isostructural groups;complexes of Yb and Lu are amorphous.The carbo-xylate groups in these complexes are symmetrical,bidentate chelating or bridging.When heated,hydrated complexes first loose molecules of water;then decompose to oxides of the respective metals.Solubility of these complexes in water at 293 K is of the order of 10~(-3) mol centre dot dm~(-3).