Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Effects of Solvents and pH on the Spectral Behavior of 2-(p-Aminophenyl)benzimidazole
Ashok Kumar MishraSneh Kumar Dogra
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1985 Volume 58 Issue 12 Pages 3587-3592


The absorption and fluorescence spectra in different solvents and at various pH have indicated that monocation and dication of 2-(p-aminophenyl)benzimidazole (PBNH2) are formed by protonating first the tertiary amine nitrogen atom and then the amino group, both in S0 and S1 whereas the monoanion in S0 is obtained by deprotonating the imino group but in S1 it is formed by deprotonating the amino group. Dianion at H15 in S1 is obtained by deprotonating the amino and then imino group.

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