Reversible Photoinduced Change in Molecular Ordering of Diarylethene Derivatives at a Solution−HOPG Interface
摘要:
A diarylethene-pyrene diad and a diarylethene-pyrene-diaryiethene triad were synthesized to investigate the photoinduced two-dimensional ordering change at a solution-HOPG interface. The molecular arrangements were detected by STM. The different photochromic isomers showed different orderings reflecting the differences in their molecular structures. For the diaryiethene-pyrene-diarylethene triad, a new ordering appeared upon irradiation with UV light and returned to the original ordering upon subsequent irradiation with visible light. The new arrangement was assigned to the ordering of the closed-closed isomers based on the images of the isolated open- and closed-isomers. The relationship between the nature of the two-dimensional ordering and the molecular structure is discussed.
Solvent effect on photochromism of a dithienylperfluorocyclopentene having diethylamino group
作者:Seiya Kobatake、Yuko Terakawa、Hiroyuki Imagawa
DOI:10.1016/j.tet.2009.05.053
日期:2009.8
Some photochromic diarylethenes having polar substituents were synthesized, and their photochromic behavior was examined. They exhibited photochromism with the similar photoreactivity in a non-polar solvent. However, the photocyclization quantum yield of dithienylperfluorocyclopentene having diethylamino group was found to decrease in polar solvents. The yield in acetonitrile was estimated to be 60 times smaller than that in hexane. The yields determined in various solvents were found to be correlated with the solvent polarity parameter E-T(30). Such an effect was not observed in dithienylfluorocyclopentenes bearing methoxy or acetoxy group and in non-fluorinated dithienylcyclopentene bearing diethylamino group. (C) 2009 Elsevier Ltd. All rights reserved.
Reversible Photoinduced Change in Molecular Ordering of Diarylethene Derivatives at a Solution−HOPG Interface
A diarylethene-pyrene diad and a diarylethene-pyrene-diaryiethene triad were synthesized to investigate the photoinduced two-dimensional ordering change at a solution-HOPG interface. The molecular arrangements were detected by STM. The different photochromic isomers showed different orderings reflecting the differences in their molecular structures. For the diaryiethene-pyrene-diarylethene triad, a new ordering appeared upon irradiation with UV light and returned to the original ordering upon subsequent irradiation with visible light. The new arrangement was assigned to the ordering of the closed-closed isomers based on the images of the isolated open- and closed-isomers. The relationship between the nature of the two-dimensional ordering and the molecular structure is discussed.
Self-Assembly of Photochromic Diarylethenes with Amphiphilic Side Chains: Core-Chain Ratio Dependence on Supramolecular Structures
作者:Takashi Hirose、Masahiro Irie、Kenji Matsuda
DOI:10.1002/asia.200800340
日期:2009.1.5
diarylethene derivatives having different lengths and numbers of poly(ethylene glycol) sidechains were synthesized and their photochromic property and self‐assembling behavior were investigated. The self‐assembling behavior of the derivatives strongly depends upon the ratio between the hydrophobic core and the amphiphilic sidechain. According to UV/Vis absorption spectroscopy, CD spectroscopy, and dynamic light