稀土HEH[EHP]固体配合物的红外光谱

INFRARED SPECTRA OF RARE EARTH COMPLEXES OF 2-ETHYLHEXYL PHOSPHONIC ACID MONO(2-ETHYLHEXYL)ESTER

本文制备了La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y等十五种稀土与2-乙基己基膦酸单(2-乙基己基)酯的固体配合物,测定了4000-100cm^(-1)的FT-IR光谱,对其主要红外光谱吸收带进行了归属。指认150cm^(-1)为Ln-O键的伸缩振动带,250cm^(-1)附近的谱带为COPO,CCPO骨架扭曲振动与Ln-O键的耦合振动带。结果表明配合物为多聚体系,PO_2与稀土离子可能为桥式配位形式。Ln-O键基本上为离子键。

The solid complexes of La, Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho, Er,Tm, Yb, Lu, and Ywith 2-ethylhexyl phosphonic acid mono(2-ethylhexyl)ester were prepared.FTIR spectra ofthese complexes have been studied and the principal infrared absorption bands have beenassigned for region 4000-100cm^(-1).The 150cm^(-1) is believed to be Ln-O stretching vibrationband, and the band near 250cm^(-1) is the coupling band of COPO, CCPO skeleton torsionvibration with Ln-O bond. The experimental result showed that Ln-O bonds in these rareearth complexes are principally ionic.,The FO_2 coordination with rare carth is in bridgingform. A Volymeric model of the complexes is proposed(Fig. la)