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Protonation Reactions of a Few Benzimidazoles in Anionic Micelles in the Ground and Excited Singlet States

✍ Scribed by Shalini Nigam; Ranjit S. Sarpal; Sneh K. Dogra

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 295 KB
Volume: 163
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1994.1091

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✦ Synopsis

Spectral characteristics of six benzimidazoles (BIs) have been studied as a function of sollium dodecyl sulfite (SDS) at a given plI and as a function of plI at a given SDS concentration. Distribution of Bls into micellar and aqueous phases has been determined using a selective fluorescence quenching method. Binding constants of the Bls and their monocations (\left(\mathrm{Bl}^{+} \mathrm{s}\right)) to SDS micelles have been calculated. Apparent p (K_{a}) values for the prototropic equilibrium have been found for each BI. The change in the apparent (\mathrm{p} K_{a}) values depends upon the solubilizing power of the micelles, as well as on the location of the protonating site in the molecule. 1994 Academic Press. Inc.

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