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Ground and excited state prototropism of 2-(4 '-pyridyl)benzimidazole in micelles

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Title Ground and excited state prototropism of 2-(4 '-pyridyl)benzimidazole in micelles
 
Creator KHORWAL, V
DATTA, A
 
Subject Fluorescence
SDS
CTAB
TX-100
Lifetime
PROTON-TRANSFER PROCESSES
SELECTIVE ENHANCEMENT
NAFION MEMBRANES
DODECYL-SULFATE
SLOW DYNAMICS
2-(2'-PYRIDYL)BENZIMIDAZOLE
FLUORESCENCE
SOLVENT
2-(6'-HYDROXY-2'-PYRIDYL)BENZIMIDAZOLE
TAUTOMERISM
 
Description The effect of micelles on ground and excited state prototropism of 2-(4'-pyridyl)benzimidazole (4PBI) has been studied by fluorescence spectroscopy. It has been observed that in sodium dodecyl sulfate (SDS) micelle, 4PBI is preferentially protonated at the pyridyl nitrogen atom, in contrast to the situation in neat aqueous solutions, in which imidazole and pyridyl nitrogen atoms have equal propensity for protonation. In SDS, the protonation of the benzimidazole nitrogen occurs only in the excited state. Such effects are not observed in cationic cetyl trimethyl ammonium bromide (CTAB) and neutral Triton X-100 (TX-100). Thus. 4PBI shows very good sensitivity for negatively charged interfaces between aqueous and apolar compartments in microheterogeneous media. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-10-16T06:31:08Z
2014-10-16T06:31:08Z
2012
 
Type Article
 
Identifier JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 25099-102
http://dx.doi.org/10.1016/j.jphotochem.2012.08.014
http://dspace.library.iitb.ac.in/jspui/handle/100/15439
 
Language en