By Helen Zhang, M. Han, X. J. Zhao
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21 (2002), p. 1060  H. Z. Y. Tu and K. Müllen: Adv. Mater. Vol. 17 (2002), p. 918  T. Fukaminato, T. Kawai, S. Kobatake and M. Irie: J. Phys. Chem. B. Vol. 107 (2003), p. 8372 Advanced Materials Research Vol. com Keywords: Photochromism; Fluorescence; Kinetics; Diarylethene. Abstract. A new unsymmetrical photochromic diarylethene compound, 1-(2-methyl-3-benzothienyl)-2(2-methyl(5-ethynyl)trimethylsilane-3-thienyl) perfluorocyclopentene (1o) has been synthesized, and its optoelectronic properties, such as photochromism and the fluorescence spectra of diarylethene 1o in hexane solution was investigated.
The unsymmetrical diarylethene 1a exhibits good photochromic properties and can be toggled between its colorless ring-open and colored ring-closed forms by alternate irradiation with appropriate wavelengths of light. The absorption spectral changes in hexane are shown in Fig. 1. The open ring isomer has an absorption maximum at 280 which was arisen from π→π* transition. Upon irradiation with 297 nm UV light, the colorless hexane solution of compound 1a turned blue, in which absorption maximum was observed at 571 nm.
2(A) and 2(B) represents the reaction rate constant (k) of diarylethene 1o in hexane. 80 s-1 in solution, respectively. As shown in Fig. 2(B), during the cycloreversion of 1c, the relationship between –log(Abs) and exposal time also behave perfect linearity, indicating that the cycloreversion process belong to the first order reaction. Advanced Materials Research Vol. 1003 29 Fluorescence of diarylethene 1o. Fig. 0 nm, respectively. 0 × 10-5 mol L-1, the relative fluorescence intensity increased remarkably, but when the concentration increased enough high, the fluorescence intensity decreased rapidly.