Bulletin of the Chemical Society of Japan

Environmental effects on the absorption and fluorescence spectral characteristics of benzimidazole-2-carboxylic acid and its ester.

H K. Sinha, S K. Dogra

Index: Sinha, Hermant K.; Dogra, Sneh K. Bulletin of the Chemical Society of Japan, 1989 , vol. 62, # 8 p. 2668 - 2675

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Abstract

The absorption and fluorescence spectra of benzimidazole-2-carboxylic acid (BIA) and 5- chlorobenzimidazole-2-carboxylic acid (CBIA) have clearly indicated that benzimidazole (BI) ring and–COOH group are coplanar to each other and are held together in a rigid frame by intramolecular hydrogen-bonding. Dual fluorescence in observed in polar and hydrogen bonding solvents. The short wavelength fluorescence band is assigned to a structure ...