丁基膦酸单丁酯稀土络合物的振动光谱研究

Infrared and Raman Spectra of Rare Earth Complexes with Butyl Phosphonic Acid Monobutyl Ester

用稀土氯化物与丁基膦酸二丁酯反应制备了标题络合物Ln（BBP）3（Ln=La，Eu，Yb），测量了络合物4000100cm^-1的红外光谱和1500～100cm^-1的拉曼光谱，对其主要红外吸收和拉曼谱带进行了归属．指认151cm^-1的红外吸收带为Ln-O键的伸缩振动带，1138cm^-1的红外吸收和1136cm^-1的拉曼谱带为PO2基团的反对称伸缩振动带（vas PO2），1088cm^-1的红外吸收谱带为PO2基团的对称伸缩振动带（hPO2）．提出了络合物的每个稀土离子与邻近的三个稀土离子通过双-O-P（C4H9）（OC4H9）-O-桥相连接，形成“双桥二十四元环”多聚网络结构的假设模型．Ln-O键基本上为离子键．

The solid complexes of La, Eu, and Yb with butyl phosphonic acid monobutyl ester were prepared. FTIR and Raman spectra of these complexes have been measured and the principal infrared absorption bands and Raman bands have been assigned . The infrared absorption band in 151 cm^-1 is believed to be Ln-O stretching vibration band , and the infrared absorption band in 1138 cm^-1 and Raman band in 1136 cm^-1 is PO2 asymmetrical stretching vibration band（vas PO2 ）, and the infrared band in 1088 cm^-1 is PO2 symmetrical stretching vibration band（vs PO2 ）. It is suggested that each rare earth ion in the complexes links three rare earth ions nearby through double-O-P（C4 H9 ）（O C4 H9 ）-O-bridges to form a special network of rings-linking-rings, each of which consists of twenty-four atoms. The Ln-O bond is principally ionic.