N. Ayachit, A. M. Huralikoppi, M. Shashidhar
1986
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Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Abstract
Abstract The electronic absorption spectra of 5-and 6-fluoroindoles, corresponding to the λ2850 A system of indole, have been recorded in the vapour phase and analysed, assuming C s symmetry for the molecules. The observed band system in both the molecules which lies in the region λ3100–2680 A has been identified as a π* ← π transition corresponding to a 1 A ′ ← 1 A ′ transition. The i.r. spectra of these molecules have also been recorded and analysed and the results are used in the analyses of the electronic spectra. These show that there is not much change in the shape and very little change in size of either of these molecules in the excited electronic states.