吡喃酮类化合物与镱配合物的红外和拉曼光谱研究

采用非水体系中牺牲金属阳极的电化学方法分别合成了稀土金属镱与 3 羟基黄酮及 3 羟基 2 甲基 γ 吡喃酮的配合物。对配合物进行了IR和Raman光谱测定。两种光谱提供了互为补充的信息 ,配体经配位后—OH的伸缩振动谱峰消失 ,部分相关的谱峰频率发生了明显位移 ,特别是羰基伸缩振动红移十分明显 ,在Raman光谱的低波数区间检测到可指认为金属和配体键合的伸缩振动。根据这两种光谱的研究结果推断了所得配合物的可能结构。

IR and Raman Spectroscopic Studies on the Complexes of Ytterbium with Pyran Derivatives

The complexes of ytterbium(Yb) with 3-hydroxy-2-methyl-gamma-pyrone(HL) and 3-hydroxyflavone(HL') have been prepared respectively in the non-aqueous solution by direct electrochemical oxidation of sacrificial metal anodes, and their IR and Raman spectra have been measured. They provided the complemental information for deducing their structure. By comparing the spectra of the ligands and their complexes, the stretching vibrational band of -OH disappeared in the complexes, and the frequency shifts of some relevant bands of the ligands were observed, particularly for the stretching vibration of C=O. In the low frequency region, new bands at 300-500 cm(-1) were detected in YbL3 and YbL'3 respectively, which could be assigned to the stretching vibrational mode of Yb-O. All the obvious change in the IR and Raman spectra revealed that C=O and -OH were coordinated with Yb center through oxygen atoms. Based on the IR and Raman results, the structures of the two complexes were proposed.