Twist angle dependent mesomerism and spectroscopy in substituted anilines: Absorption and fluorescence spectra of indoline derivatives as planar model compounds
✍ Scribed by W. Rettig; K. Rotkiewicz; W. Rubaszewska
- Book ID
- 103905512
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 845 KB
- Volume
- 40
- Category
- Article
- ISSN
- 1386-1425
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✦ Synopsis
Absorption and emission spectra of 5-cyano-N-alkyl-indolines have been compared to those of the corresponding p-cyano-N,N-dialkylanilines, and the red shift and anomalously low absorption coefficient of the indolines analysed in terms of a molecules-in-molecules (MIM) model. The widely applied cos* 0 equation relating oscillator strength and intramolecular twist angle 0 is shown to be inadequate for near planar geometries in this case. The observation of an isoemissive point in the fluorescence spectra of the indolines indicates the existence of a around state conformational equilibrium. Fluorescence and excitation anisotropy are discussed in terms of aiibronic coupling mechanism: * Note that on the basis of REMINGTON'S data for the aband (I.&), the indoline compound should be the most planar one.