Photochromism of Mixed Crystals Containing Bisthienyl-,Bisthiazolyl-, and
Bisoxazolylethene Derivatives
Shizuka Takami, Lumi Kuroki, and Masahiro Irie
J. Am. Chem. Soc., 129, 7319-7326 (2006)
(1a)
Single crystals composed of two or three different kinds of diarylethenes,
having similar geometrical structures but different colors in the closed-ring
isomers, 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a),
1,2-bis(5-methyl-2-phenyl-4-thiazolyl)perfluorocyclopentene (2a), and 1,2-bis(5-methyl-2-phenyl-4-oxazolyl)perfluorocyclopentene
(3a) were prepared in an attempt to form single crystals which exhibit
different colors, depending on illumination wavelengths. A crystal composed
of the three derivatives in the molar ratio of 32 (1a):53 (2a):15 (3a)
was obtained. X-ray analysis proved that 1a and 3a are packed in the crystal
lattice of 2a. The mixed crystal 1a/2a/3a changed color from colorless
to yellow, red, and blue upon irradiation with light of appropriate wavelengths.
(3a)
(2a)
