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.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1991年第5期1-4,共4页
Spectroscopy and Spectral Analysis
