氯化-甘氨酸六水合稀土固体络合物的合成及红外光谱研究

Synthesis of the Solid Complexes of Monoglycinto-Hexaquo-Rare Earth Chlorides and Their Infrared Spectral Study

本文用稀土氯化物与甘氨酸反应制备了标题络合物[Ln(Gly)·6H_2O]·Cl_3(Ln=Nd,Sm,Gd,Er,Yb),测定了络合物的红外光谱,对其主要吸收带进行了归属。红外光谱的研究结果表明,甘氨酸以内盐的形式存在于络合物中,通过羧基与稀土离子配位。水分子也参与了配位。并推测,Nd的络合物为双核络合物,其它稀土络合物具有一维无限长链结构。

The title complexes [Ln(Gly) ·6H-2O] ·Cl_3(Ln = Nd, Sm, Gd, Er, Yb) were synthesized by the reaction of rare earth chlorides with glycine in aqueous solution. The IR spectra of the complexes were measured and principal IR bands were assigned. The results show that glycine molecules are zwitter-ions in the complexes and coordinate with rare earth ions through carboxyl groups, and the water molecules coordinate with rare earth ions too. Nd complex may be a dinuclear coordination and the other complexes may be one dimensional chain complexes of infinite length.