4-乙烯基联吡啶金属配合物的光谱研究

采用水热合成法以4-乙烯基联吡啶（dpe）为有机配体与铜，锌和镉的硫酸盐合成了三种金属有机配合物，利用红外、拉曼、紫外-可见光谱对dpe及合成的配位化合物进行了对比研究，对主要红外和拉曼谱带进行了归属，讨论了配体dpe和配合物的特征谱带与其结构间的关系。红外吸收光谱上，dpe中C—C伸缩和C—N面内弯曲的复合振动，在Cu-dpe，Zn-dpe和Cd-dpe配合物中分别位移到较高的波数处。在拉曼光谱中，对于相应的C—N，CC， C—C和C—H键的振动频率也看到了相同的变化规律。在紫外-可见光谱中，Zn-dpe，Cd-dpe分别只有一个配体本身的跃迁吸收峰，而配合物Cu-dpe由于发生了d—d电子跃迁，产生两个吸收峰，分别归属为配体本身的跃迁吸收谱带和配位体场吸收谱带，可见同一种配体与不同的金属离子合成的配位化合物，由于金属离子核外电子分布的不同，其紫外-可见光谱有很大变化。

Spectroscopic Study of Metal Coordination Compounds with 1,2-Trans-(4-Pyridyl)ethene

In the present article, three kinds of metal-organic coordination compounds were synthesized between 1,2-trans-(4-pyridyl)ethene (dpe) and sulfate of Cu(Ⅱ), Zn(Ⅱ) and Cd(Ⅱ) by hydrothermal reactions. Infrared, Raman and ultraviolet-visible spectra of dpe and its metal-organic complexes were studied. Assignments of the main FTIR and Raman bands were done in detail. The relationship between these characteristic bands and the structure of ligands and coordination compounds was discussed. In the FTIR spectra, the co-vibration absorption band of C—C and C—N for dpe shifts to the higher wavenumbers for three metal-organic coordination compounds, respectively. In the Raman spectra, the corresponding vibration bands of C—N, CC, C—C and C—H were also observed to shift to higher wavenumbers. In the UV-visible absorption spectra, Zn-dpe and Cd-dpe has an absorption peak which could be attributed to the ligand absorption itself. However, two absorption peaks were observed for the complex of Cu-dpe, which were ascribed to the ligand absorption band and d—d electronic transition in the coordination compound. This indicates that there is a great change in the absorption spectra for the same ligand but with different metal ions.