NDLI: Influence of acidity on the fluorescence spectra of 2-pyridylbenzimidazoles in aqueous solution

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Journal of the Chemical Society, Faraday Transactions Vol - 89 Issue - 5

Journal of the Chemical Society, Faraday Transactions Vol - 89 Issue - 4

Journal of the Chemical Society, Faraday Transactions Vol - 89 Issue - 3

Influence of acidity on the fluorescence spectra of 2-pyridylbenzimidazoles in aqueous solution

Content Provider	Royal Society of Chemistry (RSC)
Author	Novo, Mercedes Mosquera, Manuel Prieto, Flor Rodriguez
Copyright Year	1993
Abstract	The fluorescence spectra of 2-(3-pyridyl)benzimidazole (3PBI) and the quaternary salt 2-(1-methyl-4-pyridinio)-benzimidazole iodide (4PBIQS) in aqueous solutions covering a wide range of acidities have been studied to investigate their photophysical behaviour and the acid–base processes occurring in the first excited singlet states of these species. Depending on the acidity, 3PBI exists in the excited state as the dication, the monocation protonated at the benzimidazole N(3) atom (C), the neutral species and the anion. Of all the possible processes of interconversion among these species, only the protonation of C is fast enough to compete with its deactivation. 4PBIQS too has the same species in excited and ground states: the dication D, the monocation with a positive charge on the pyridyl nitrogen (T) and the zwitterion Z. Deprotonation of D, protonation of T* and deprotonation of T* by the dihydrogen phosphate anion were all detected. 3PBI and 4PBIQS thus allow separate study of the photophysical properties of the two 2-pyridylbenzimidazole monocations, C* and T*, with no interference between the two.
Starting Page	885
Ending Page	889
Page Count	5
File Format	PDF
ISSN	09565000
Volume Number	89
Issue Number	6
Journal	Journal of the Chemical Society, Faraday Transactions
DOI	10.1039/FT9938900885
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Benzimidazole Haloalkane Phosphate Fluorescence Ion Zwitterion Dication Nitrogen
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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