α-多取代联苄化合物的构型异构对激光拉曼光谱的影响

THE LASER RAMAN SPECTROSCOPIC STUDY ON TWO ISOMERS OF α-POLYSUBSTITUTE DIBENZYL COMPOUNDS

用激光拉曼光谱研究了meso-和dl-2.3-二氰基-2.3-二(p-X取代苯基)丁二酸二乙酯(X=OCH_3,CH_3,H,Cl,NO_2)的性能。通过对这五对异构体拉曼光谱的分析和比较发现,meso-异构体的最大ν_(-c-H),ν_(c-o)和苯环的变形振动ν_(苯环变形)均大于相应的dl-异构体,并结合这些异构体的X-射线晶体结构分析结果对产生实验现象进行了讨论。

Five pairs of mcso- and dl-α-polysubstitute dibenzyl compoumds have been studied by using laser Raman spectra, The Raman bonds of some groups have been analyzed. The results indicated that the meso isomers have larger v_(=C-H), v_(C=0) and deforming v_(PH) than relative dl-isomers. The effect of different configurations on laser Raman spectra is discussed.