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- W2078280462 abstract "The photoisomerization of 1-alkyl-2-(arylazo)imidazole, trans-to-cis, has been studied in the matrix of PEG-200 and Tween-20 in toluene medium by UV light irradiation. The trans and cis-isomers have different absorption spectra. The cis-to-trans isomerization proceeds slowly in visible light irradiation while it is appreciably fast in thermal process. The rate of trans-to-cis isomerization is decreased by 30-60% in presence of PEG-200 and Tween-20. The quantum yield of the photoisomerization is also decreased by 35-55% and follows the rate sequence: free state>PEG-200-phase>Tween-20 phase. The activation energy (E(a)) of cis→trans, thermal backward isomerization, is reduced in PEG-200 and Tween-20 phase following free state>PEG-200-phase>Tween-20-phase. The branched polyhydroxo structure of Tween-20 may help to wrap the polar photochrome more efficiently than major ether functionalized PEG-200 and stabilizes trans-isomer." @default.
- W2078280462 created "2016-06-24" @default.
- W2078280462 creator A5007099727 @default.
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- W2078280462 date "2012-12-01" @default.
- W2078280462 modified "2023-10-16" @default.
- W2078280462 title "Effect of PEG-200 and Tween-20 on photoisomerization of 1-alkyl-2-(arylazo)imidazoles in toluene" @default.
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- W2078280462 doi "https://doi.org/10.1016/j.saa.2012.08.052" @default.
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