Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 4, Pages 1246-1249Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm02691c
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Funding
- National Basic Research Program of China [2010CB934103]
- National Nature Science Foundation of China [21073214]
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A photochromic diarylethene (1a) with three bis(thien-3-yl) systems, containing a 2,5-dihydrothiophene unit and two imidazole units, has been prepared. 1a shows selective photochromism: upon irradiation with 365 nm, one bis(thien-3-yl) system containing a 2,5-dihydrothiophene unit is selected to undergo photocyclization reaction to form ring-closed isomer 1b, the other two bis(thien-3-yl) systems containing imidazole units are photo-inactive. With 254 nm light irradiation, all three bis(thien-3-yl) systems undergo photocyclization reaction to produce ring-closed isomer 1c. Selective solvatochromism was also observed at a ring-closed state: only 1c showed solvatochromism, and the solvatochromism was dependent on the solvent donor numbers: with the increase of donor numbers of solvent, the absorption of 1c shifted to shorter wavelength.
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