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The chemistry of carbazoles. VIII. Effect of methyl groups on the electronic spectra of carbazole
Author(s) -
Tsunashima Yutaka,
Kuroki Masatane
Publication year - 1981
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570180415
Subject(s) - chemistry , carbazole , additive function , spectral line , electronic effect , absorption spectroscopy , wavelength , computational chemistry , photochemistry , analytical chemistry (journal) , stereochemistry , organic chemistry , steric effects , quantum mechanics , mathematical analysis , physics , mathematics
Electronic spectra of a number of methylcarbazoles were measured. Spectral shifts of the longest wavelength absorption bands were evaluated by the HMO‐perturbation method. The calculated shifts of 1‐substituted (group II) and 4,5‐disubstituted carbazoles (group III) did not agree with the observed values. The effect of the methyl group on the direction and magnitude of the shift is closely additive except for 4,5‐disubstituted carbazoles. The additivity principle is a useful tool for determination of methylcarbazoles.