A simple preparative method of N-arylindigos and substitution effect in UV/visible absorption

摘要

N-Aryl- and N,N'-diarylindigos were prepared by refluxing corresponding aryl iodides or bromide with indigo in o-dichlorobenzene. Variation of their UV/visible spectra with the ring-substitution was discussed on the basis of the captodative and steric effects.