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Infrared and electronic absorption spectra of some trisubstituted benzenes

1989; Pergamon Press; Volume: 45; Issue: 2 Linguagem: Inglês

10.1016/0584-8539(89)80110-2

1873-3824

Rekha Rao, M.K. Aralakkanavar, K. Suryanarayana Rao, M.A. Shashidhar,

Analytical Chemistry and Chromatography

Abstract The electronic absorption spectra of 2,3-, 2,4-, 2,5-, 2,6- and 3,4-difluorobenzonitriles, 3,4-difluoroaniline and 3,4-difluoroanisole in the ultraviolet region in vapour phase have been recorded on medium quartz and Hilger large quartz spectrographs and on a Hitachi model 150-20 UV-VIS ratio recording spectrophotometer. All the molecules investigated have exhibited two π* ← π band systems corresponding to 1 B 2 u ← 1 A 1 g (λ2600 A) and 1 B 1 u ← 1 A 1 g (λ2100 A) systems of benzene. The infrared absorption spectra of all the molecules studied have also been recorded and analysed. These infrared data have been taken to help analyse the u.v. spectra of the molecules studied.