Abstract
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
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