多酸有机亚胺衍生物的紫外可见光谱及其取代基效应

The UV-Vis Spectra and Substituent Effect of Organoimido Deriv atives of Polyoxometalates

以(Bu4 N) 4[αMo8O2 6 ]和各种取代苯胺及其盐酸盐为原料,在碳二环己基亚胺(DCC)存在下,经脱水反应,合成了多种六钼酸根有机亚胺衍生物,并用元素分析,1 H NMR ,IR和UV Vis光谱等进行表征,重点研究了六钼酸根有机亚胺衍生物在乙腈溶液中的紫外光谱。研究结果表明,该类化合物具有典型的分子内电子转移的紫外可见光谱特征,其特征峰位移Δλmax与苯胺的苯环取代基的共轭效应指数(σR)之间存在良好的线性关系。

In the presence of a carbodiimine, i. e. DCC, a series of organoimido derivatives of polyoxometalates have been synthesized via the reaction of [ alpha-Mo-8 O-26 ](4-) with aromatic amines and its hydrochloride salt. Elemental analysis, IR, H-1-NMR and UV-Vis spectra were used to characterize those hybrids, in particular their UV-Vis spectra have been studied. The results show that typical metal-ligand charge transfer (MLCT) transitions occur in the organic- inorganic hybrid molecules. There is a good linear relationship between the shift of UV-Vis absorptions(Delta lambda(max)) and conjugation effect of the p-substituted group (sigma(R)).