利用可见光谱、~1H NMR谱及溶剂效应研究结晶紫等染料的n与π电子的行为  

A STUDY OF THE BEHAVIOR OF n AND π ELECTRONS IN THE CRYSTAL VIOLET AND OTHER DYES BY VISIBLE SPECTRA AND ~1H NMR AS WELL AS SOLVENT EFFECT

作　　者：齐德林[1] 奚晓秋 费昌沛[1] 

机构地区：[1]中国科学院化学研究所,北京100080

出　　处：《光谱学与光谱分析》1991年第5期1-4,共4页Spectroscopy and Spectral Analysis

摘　　要：本文解决了结晶紫在可见光谱区谱峰归属于n和π电子的跃迁问题。并得出氢键、质子化、电荷转移、还原、含氧和含氯的偶极子以及烷基和芳基等8种溶剂效应的作用机制。In this paper, we solve the problem of visible spectra of crystal violet (CV) by the method of Kasha and MacConnell as well as solvent effect of fatty acids. The peak B and A are belong to the n and π electron transation respectively. In conc. strong acids the peak B disapcared.We get the mechanism of solvent effect (1) The hydrogen bond formation and protonation as above mentioned. (2) In nitrobenzene, a charge transfer complex formed from LCV and the solvent. In alkylalyamines, the CV is reduced and decolourized, but in phenylamine, it is not decolourized and all the bands are red shift. (3) In dipolar solvents such as aectone etc.…, containing oxygen atom, there is a linear relationship between the B bands and the Z values, but the peak A are little affected. In the solvent as chloroform etc.…, when the number of chlorine atom increase the B bands are more blue shift and the A bands more red shift. (4) There are linear relationships betwccn the pK_a values of fatty acids and the visible bands he chemical shift of methyl and phenyl group. In the aromatic solvents there are linear relationships between the chemical shift of methyl group of CV and the Hammett and modified Hammett substituent constant.

关 键 词：结晶紫 电子光谱 溶剂效应 NMR 

分 类 号：TQ615.3[化学工程—精细化工]