Electronic spectrum of bibenzimidazole homologue: effects of solvents and acid concentration

A Kumar, HK Sinha, SK Dogra

Index: Kumar, Awadesh; Sinha, Hemant K.; Dogra, Sneh K. Canadian Journal of Chemistry, 1989 , vol. 67, p. 1200 - 1205

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Citation Number: 8

Abstract

The absorption and fluorescence spectra of bibenzimidazole (BBI), N, N'- dimethylbibenzimidazole (MBBI), and methylene, 2, 2'-bibenzimidazole (MtBBI) have been recorded in six solvents of different characteristics and at various acid concentrations. This study indicates the presence of intramolecular hydrogen bonding in BBI in both S 0 and S 1 states, leading to large conjugation of two benzimidazole (BI) rings. The geometry of BBI is ...