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Synthesis of novel chalcone derivatives and their stabilization effect of spiropyran in PMMA films |
Zheng Kai Si, Qing Zhang, Min Zhao Xue, Yuan Yuan Zhu, Liang Ming, Qiao Rong Sheng, Yan Gang Liu |
School of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract Three novel bis-chalcone derivatives with different alkyldioxy spacers were synthesized and dispersed into polymethyl methacrylate (PMMA) chloroform solution with 6-nitro-1'-ethyl-3', 3'-dimethylspiro-2H-1-benzopyran-2, 2'-indoline (ESP) to prepare photochromic PMMA films in a facile way. After irradiation with 365 nm UV light, the photocrosslinking reaction between chalcone units was proved to retard the decolorization of merocyanine form of the photochromic spiropyran effectively, as results of the steric hindrance produced by photocycloaddition of chalcone groups. It has been found that the bis-chalcone molecule with the shortest spacer has the most effective stabilizing effect on retardation of decoloration of spiropyran.
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Received: 23 November 2010
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Fund:We are grateful for the financial support from the National High Technology Research and Development Program of China (No. 2005AA320030) and SJTU-Aeronautics Industry Joint Program (No. 0304). We thank Dr Dongqing Wu for discussions. |
Corresponding Authors:
Yan Gang Liu,E-mail address:ygliu@sjtu.edu.cn
E-mail: ygliu@sjtu.edu.cn
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About author:: 10.1016/j.cclet.2011.04.001 |
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