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Rev Vol. 100 (2000), p. 1685 [3] A. Bianco, C. F. Rabolt and G. Zerbi : Chem. Mater Vol. 17 (2005), p. 869 [4] M. Morimoto, S. Kobatake and M. Irie: J. Am. Chem. Soc Vol. 125 (2003), pp. 11080 [5] D. Dulic, T. Kudernac, A. Puzys, B. L. Feringa and B. J. Wees: Adv. Mater Vol. 19 (2007), pp. 2898 [6] Y. M. G. L. Yao, and N. Menke: Opt. Mater. Vol. 26 (2004), p. 75 [7] G. Li, T. Z. K. Xu: Acta Cryst. E, International Union of Crystallography, Paris, Vol. 62 (2006), p. X. Y. Liao, W. H. Xu, C. J. H.

Firstly, compound 4 and 6 was prepared by reacting compound 2 with 1-brom-3-chlorophenyl and 2-bromopyridine in the presence of tetrakis(triphenylphosphine)palladium(0) and Na2CO3 in THF for 16h at 343K. Secondly, under an argon gas atmosphere, compound 4 was dissolved in THF and n-butyl lithium hexane solution was added at 195K. Stirring was continued for 30 min at this low temperature; octafluorocyclopentene was added and the mixture was stirred for 2h at this temperature. The reaction mixture was extracted with diethylether, dried with 28 Advances in Materials Science anhydrous MgSO4, filtered, and evaporated in vacuo, then purified by column chromatography to give compound 7 (2-methyl-5-(3-chlorophenyl)-3-thienyl -perfluorocyclopenten) white solid.

2. Absorption spectra of compound 1a in PMMA amorphous film(10%w/w). 0 nm. Fig. 0 × 10-5 mol/L) upon irradiation with 297 nm UV light at room temperature. As shown in Fig. 3, it could be clearly seen that the 1a exhibited relatively strong fluorescence at 407 nm when excited at 305 nm. The fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers upon irradiation with 297 nm UV light, due to producing the weak fluorescence closed-ring isomer. The incomplete cyclization reaction and the existence of parallel conformations may be the main cause for the moderate change in fluorescence induced by photoirradiation.

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