Phenylazoindole dyes 2: The molecular structure characterizations of new phenylazo indoles derived from 1,2-dimethylindole
摘要:
In this study, five new phenylazo indoles derived from 1,2-dimethylindole were synthesized and characterized to evaluate the substituent effects on the molecular structures and absorption spectra. Theoretical calculations were carried out by density functional theory. The experimental and theoretical results are compared. X-ray single-crystal diffraction analyses reveal that the dyes have similar planar molecular conformation between azo and aromatic/heteroaromatic ring units but dissimilar crystal packing. The analysis of the electronic spectra showed that the electron-withdrawing groups (-Cl and -CN) were more effective than the electron-donating groups (-CH3 and -OCH3). Dyes containing electron-donating groups do not show significant changes relative to the parent dye, whereas the absorption maxima move to longer wavelengths for dyes containing electron-withdrawing groups. In addition, the absorption maxima exhibit the little bathochromic shifts for each dye with the increasing dielectric constants of the solvents. (C) 2013 Published by Elsevier Ltd.
Iodine-Catalyzed Diazenylation with Arylhydrazine Hydrochlorides in Air
作者:Dinesh S. Barak、Shashikant U. Dighe、Ilesha Avasthi、Sanjay Batra
DOI:10.1021/acs.joc.7b03149
日期:2018.4.6
A mildapproach to diazenylation of active methylene compounds and N-heterocyclic compounds with arylhydrazine hydrochlorides in the presence of iodine under basic aerobic conditions was developed. The reaction could be executed either under heating or in the presence of blue LED light, though the latter condition was found to be relatively efficient. Presumably, the aryldiazene produced by oxidation