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Photochromism of 3-butyl-1-methyl-2-phenylazoimidazolium in room temperature ionic liquids

Paper ID Volume ID Publish Year Pages File Format Full-Text
27696 44038 2010 7 PDF Available
Title
Photochromism of 3-butyl-1-methyl-2-phenylazoimidazolium in room temperature ionic liquids
Abstract

We studied the photochromism of a newly synthesized ionic liquid, [2PA-Bmim]Tf2N ([2PA-Bmim]+: 3-butyl-1-methyl-2-phenylazoimidazolium, Tf2N−: bis(trifluoromethanesulfonyl)-amide) which is characterized by a phenylazo group substituted on the imidazolium ring. The melting point of [2PA-Bmim]Tf2N is 329 K. The absorption spectrum of [2PA-Bmim]+ dissolved in conventional organic solvents or in ionic liquids changes drastically upon UV-light irradiation, which is attributed to the photoisomerization of the phenylazo group from E- to Z-forms during irradiation and the backward thermal isomerization from Z- to E-forms in the dark. The E–Z photoisomerization quantum yield, Φiso, was determined by 355 nm laser photolysis. The Φiso value slightly depends on solvent viscosity, from 0.12 in 3-butyl-1-methylimidazolium PF6− (η = 241 cP) to 0.19 in toluene (η < 1 cP). On the other hand, no solvent dependence was observed for Arrhenius parameters of the backward Z–E thermal isomerization. We discuss the isomerization mechanism and the reason why the E–Z photoisomerization yield depends on solvent viscosity.

Keywords
Ionic liquid; Photoisomerization; Photochromism
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Photochromism of 3-butyl-1-methyl-2-phenylazoimidazolium in room temperature ionic liquids
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 209, Issue 1, 1 January 2010, Pages 12–18
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