Original scientific paper

Electronic Absorption and Fluorescence Spectra of Indole . Derivatives. Quantitative Treatment of the Substituent Effects and a Theoretical Study

Jean-Jacques Aaron ; Departement de Chimie, Faculte des Sciences, Universite de Dakar, Dakar-Fann, Senegal
Alphonse Tine
Claude Villiers ; Laboratoire de Chimie Solaire, C.N.R.S., 2-8, rue Henri Dunant, F-94320 Thiais, France
Cyril Parkanyi ; Department of Chemistry, The University of Texas at El Paso, El Paso, Texas 79968, U.S.A.
Danielle Bouin ; Department of Chemistry, The University of Texas at El Paso, El Paso, Texas 79968, U.S.A.

Abstract

The room-temperature absorption spectra of nine substituted
indoles containing the acetyl, bromo, carboxy, cyano, formyl,
methoxy, methyl, and nitro substituents have been measured in
cyclohexane, methanol, ethanol, ethanol-water (1 : 9, vol.), and in
0.1 .M NaOH ethanolic solution. The room-temperature excitation
and emission fluo.rescence spectra of these compounds have been
obtained in cyclohexane and ethanol. Satisfactory linear Hammett
correlations have been established for the electronic absorption
and fluorescence maxima wavenumbers of most of the indoles.
PPP quantum-chemical calculations indicate a good agreement
between the experimental and calculated electronic transitions
and provide information about the distribution of Jt-electrons in
the ground and the lowest excited singlet states of indole derivatives.

Keywords

Hrčak ID:

194220

URI

https://hrcak.srce.hr/194220

Publication date:

30.6.1983.

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