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Photoinduced electron transfer between coumarin dyes and N,N-dimethylaniline in imidazolium based room temperature ionic liquids: Effect of the cation's alkyl chain length on the bimolecular photoinduced electron transfer process

Paper ID Volume ID Publish Year Pages File Format Full-Text
26553 43962 2013 11 PDF Available
Title
Photoinduced electron transfer between coumarin dyes and N,N-dimethylaniline in imidazolium based room temperature ionic liquids: Effect of the cation's alkyl chain length on the bimolecular photoinduced electron transfer process
Abstract

•PET between coumarins and DMA are explored in RTIL with different alkyl length.•The quenching efficiency of C152 by DMA increases upon increasing alkyl length.•The static quenching component of C152 by DMA in RTIL is dominated.•The fluorescence lifetime of C152 in RTIL increases upon increasing alkyl length.•The fluorophore's lifetime plays an important role in its bimolecular PET process.

Photoinduced electron transfer (PET) reactions in room temperature ionic liquid (RTIL) have been paid great interests due to their potential applications in the field of solar energy conversion. In this work, we selected four commonly used coumarin dyes and studied the bimolecular PET reaction between respective coumarin dye and N,N-dimethylaniline (DMA) in [Emim][BF4], [Bmim][BF4], [Hmim][BF4] and [Dmim][BF4] by means of both the steady-state and time-resolved fluorescence spectroscopies. We found that the fluorescence quenching efficiency of Coumarin 152 (C152) by DMA increases with the increase of the cation's alkyl chain length of RTIL and that the fluorescence quenching efficiencies of Coumarin 102 (C102), Coumarin 151 (C151) and Coumarin 153 (C153) by DMA decrease with the increase of the cation's alkyl chain length of RTIL. We also found that the fluorescence lifetime of C152 increases with the increase of the cation's alkyl chain length of RTIL and that the fluorescence lifetimes of C102, C151 and C153 maintain constant with the increase of the cation's alkyl chain length of RTIL. In addition, we also found that the static quenching components in the fluorescence quenching of C152 by DMA in RTIL are dominated. These results demonstrate that the fluorescence lifetimes of selected fluorophores play important roles in their bimolecular PET fluorescence quenching processes in viscous media.

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Keywords
Bimolecular photoinduced electron transfer; Fluorescence quenching; Cation's alkyl chain length of RTIL; Marcus-type inversion; Stern–Volmer equation
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Photoinduced electron transfer between coumarin dyes and N,N-dimethylaniline in imidazolium based room temperature ionic liquids: Effect of the cation's alkyl chain length on the bimolecular photoinduced electron transfer process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 260, 15 May 2013, Pages 39–49
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us