Properties of the Oxygen 2 p-Electrons of Dibenzofuran (Part 2) -Substituent Effect on the Electronic Spectra of. Fluorene and N-Methylcirbazole--

Abstract

Substituent effect on the electronic spectra of fluorene [F] and N-methylcarbazole [NMC] was examined. Their L_b absorption bands were very sensitive to the substituent at the 2- position The wavenumber of L_b bands was related to the parameter |σ_R| of the substituent at the 2-position. From the comparison of the present results with those for dibenzofuran [D] which were reported previously, the intramolecular interaction of the oxygen 2ρ-electrons of [D] with the π-electron system was discussed. The substituent effect at the 3-position on the L_a band of [F] was also examined and compared with the results for [D].