Download PDF by Edited by Tianharry Chang: Advances in Materials Science

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By Edited by Tianharry Chang

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2] P. H. Yang, S. S. Hu, J. Y. 349-354,(2000). [3] X. C. Wang, X. H. Jiang, J. 63-65, (2002). [4] X. K. Zhang, X. F. Lu, C. 2647-2650, (2006). [5] C. D. Zang, G. L. 6, 16-19, (1999). [6] W. G. Pan, Y. B. Zhou, Y. Z. 528 – 532, (2010). [7] F. Y. Zhou, J. M. Shan, W. 57-62, (2009) [8] C. S. Wang, Research and Realization of Ship Course Autopilot Based on Auto Disturbance Rejection Controller, Shandong University, p:53, (2009). [9] W. F. 37-40,(2009). cn Keywords: Diarylethene, Different substituents, Photochromism, Optical Recording.

They have shown to be one of the most promising of memory media that meet such demands. Among various types of photochromic compounds, diarylethenes with attached thiophene rings are regarded as the most promising classes of photochromic materials [3]. Photochromic compounds and derivatives undergo a photo-induced reversible isomerization process between two isomers with different absorption spectra upon irradiation with light of appropriate wavelength [4,5]. The openand closed-ring isomers of the diarylethene differ from each other not only in their absorption but also in various physical and chemical properties, such as luminescence, refractive indices, oxidation/reduction potentials, and chiralproperties, magnetic interactions, and so on [6].

5M n-BuLi/hexane solution at 195K under an argon atmosphere. After 30 min, compound 7 was added and the mixture was stirred for 2h at this temperature. The reaction mixture was extracted with diethylether, dried with anhydrous MgSO4, filtered, and evaporated in vacuo, then purified by column chromatography to give 1a reddish brown oil liquid in 30% yield. The structure of 1a was characterized by 1H NMR. The structure of 1a was characterized by 1H NMR. 53(S, 1H, pyridine-H ). Cl F Br Br 3 S F S F F Cl n-BuLi,C5F8 Cl S 195K 7 4 B(OH)2 F F Pd(PPh)3 Na2CO3,aq Br F N Br 2 Br F 5 Pd(PPh)3 Na2CO3,aq S N n-BuLi,195K F F F F F S S Cl 6 N 1a Scheme 2.

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Advances in Materials Science by Edited by Tianharry Chang

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