'Ship-in-a-bottle' synthesis and photochromism of spiropyrans encapsulated within zeolite Y supercages
'Ship-in-a-bottle' synthesis and photochromism of spiropyrans encapsulated within zeolite Y supercages
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DOI：
10.1016/s0040-4020(00)00515-9
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发表时间：
2000-09-01
期刊：
影响因子：
2.1
通讯作者：
Márquez, F
中科院分区：
文献类型：
--
作者：
Casades, I;Constantine, S;Márquez, F
通过2-亚甲基-1，3，3-三甲基吲哚啉与适当取代的苯甲醛的缩合反应，在NaY超笼内进行了三个螺吡喃的瓶中合成。反应后，在上清液中检测到螺吡喃，沸石变成有色的。燃烧化学和热重分析证实了固体中存在有机材料。UV-Vis和拉曼光谱与螺吡喃光致变色体系的汞形式的形成是相容的。在可见光照射下，固体会漂白，在某些情况下，在黑暗中长时间放置后会重新着色。这种异常的光致变色行为是观察到的spiropyran/mercury系统在乙醇中的相反，并说明了沸石作为介质的可能性，以改变分子特性的纳入客人。(C)2000爱思唯尔科技有限公司版权所有。
The ship-in-a-bottle synthesis of three spiropyrans inside the NaY supercages was carried out by the condensation of 2-methylene-1,3,3-trimethylindoline with the appropriate substituted benzaldehyde. After the reaction, spiropyrans were detected in the supernatant and the zeolites became coloured. Combustion chemical and thermogravimetric analyses confirmed the presence of organic material within the solid. UV-Vis and Raman spectroscopies are compatible with the formation of the merocyanine form of the spiropyran photochromic system. Upon visible irradiation the solids bleach, and in some cases the coloration is regained upon standing in the dark for long periods. This abnormal photochromic behaviour is the reverse of that observed for the spiropyran/merocyanine system in ethanol and illustrates the possibility of zeolites as media to alter the molecular properties of incorporated guests. (C) 2000 Elsevier Science Ltd. All rights reserved.