Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 11, Issue 2, Pages 534-542Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200400575
Keywords
diarylethene; multifrequency recording; nondestructive readout; photochromism; polymers
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A photochromic polymer film containing three different diarylethene derivatives, that is, 1,2-bis(3,5-dimethyl-2-thienyl)perfluorocyclopentene (1), 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene (2), and 1,2-bis(2methyl-5-phenyl-3-thienyl)perfluorocy- clopentene (3) was prepared. Upon UV irradiation, the three derivatives changed to their closed-ring isomers having different colors, yellow, red, and blue. They showed different spectra not only in UV/Vis region but also in the IR spectral region. Upon irradiation with visible light of appropriate wavelengths, each closed-ring isomer was selectively bleached, and three bits eight states recording was performed. The eight states could be read out nondestructively by using IR light of appropriate wavenumbers.
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