镧系硅钨杂多酸胍盐的合成及物性研究

Studies on Synthesis and Characterization of Guanidinium Salts of Lanthanides-Hctcropolytungstosilicate

合成了LnL(L代表配体)型镧系硅钨杂多配合物K_5[LnSiW_(11)O_(39)],再分别与盐酸胍盐反应,得(CN_3H_5)_5[LnSiW_(11)O_(39)]·nH_2O。阳离子交换试验证明Ln^(3+)居于配合物内界。用IR、UV、DSC-TGA和XRD分析,对杂多配合物进行了表征。

Potassium salts of lanthanides-heteropolytungstosilicate,LnL, were synthesised in weak basic solution in the presence of Ln3+(Ln = La, Pr. Nd, Sm-Yb). Then,they, were turned into their guanidinium salts, (CN3H6)5[LnSiW11O39] nH2O, by the way of metathesis reaction. It is shown that Ln3+ is in the inner-coordination sphere according to the resuluts of cation exchange. The guanidinium salts of lanthanides-heteropolytungstosilicate were characterized by IR,UV spectra, DSC-TGA and X-ray powder diffraction.