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2-(2 '-Pyridyl)benzimidazole as a Fluorescent Probe of Hydration of Nafion Membranes

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Title 2-(2 '-Pyridyl)benzimidazole as a Fluorescent Probe of Hydration of Nafion Membranes
 
Creator IYER, ESS
SAMANTA, D
DEY, A
KUNDU, A
DATTA, A
 
Subject STATE PROTON-TRANSFER
NORMALIZED EMISSION-SPECTROSCOPY
SELECTIVE ENHANCEMENT
EXCHANGE MEMBRANES
SLOW DYNAMICS
WATER
2-(2-PYRIDYL)BENZIMIDAZOLE
SYSTEMS
 
Description 2,2'-(Pyridyl)benzimidazole is used as a probe to explore proton transfer through nafion membranes. The probe marks the availability of water in native as well as cation-exchanged membrane. Using steady state and time-resolved fluorescence studies, it has been shown that the rotation of the pyridyl and benzimidazole rings with respect to each other, which is ultrafast in higher water contents, is hindered as the water content in the membranes is decreased. In cation-exchanged membranes, it is observed that the formation of the ESPT (excited state proton transfer) state is reduced to a large extent. Thus, it may be inferred that the proton transport is observed to be hindered even in molecular dimensions of one water molecule thereby bolstering the contention that it may not be essential for water channels to break for proton conductivity to decrease.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-10-16T12:51:08Z
2014-10-16T12:51:08Z
2012
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY B, 116(5)1586-1592
http://dx.doi.org/10.1021/jp210145e
http://dspace.library.iitb.ac.in/jspui/handle/100/15592
 
Language en