Ground and excited state prototropic reactions in 2-( o-hydroxyphenyl)benzimidazole

A solvent dependence study of the steady state absorption, excitation and fluorescence spectra of 2-( o-hydroxyphenyl) benzimidazole has indicated the presence of different tautomers in the S 1 state which have the same precursor in the S 0 state. A similar study as a function of hydrogen ion concen...

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Bibliographic Details
Published in:Chemical physics 1986-03, Vol.102 (3), p.337-347
Main Authors: Sinha, Hemant K., Dogra, Sneh K.
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Molecular properties and interactions with photons
Physics
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Summary:A solvent dependence study of the steady state absorption, excitation and fluorescence spectra of 2-( o-hydroxyphenyl) benzimidazole has indicated the presence of different tautomers in the S 1 state which have the same precursor in the S 0 state. A similar study as a function of hydrogen ion concentration has identified the presence of dication, monocation, zwitterion, phototautomer and monoanion species. The respective pK a and pK * a values have been determined with fluorimetric titrations and Förster cycle methods and compared.
ISSN:0301-0104
DOI:10.1016/0301-0104(86)80006-4