Selective Host-Guest Co-crystallization of Pyridine-Functionalized Tetraphenylethylenes with Phthalic Acids and Multicolor Emission of the Co-crystals

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• 作者：Dr. Hai-Tao Feng ; Dr. Jia-Bin Xiong ; Dr. Jun Luo ; Dr. Wen-Fang Feng ; Prof. Desuo Yang and Prof. Yan-Song Zheng
• 刊名：Chemistry - A European Journal
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：23
• 期：3
• 页码：644-651
• 全文大小：5210K
• ISSN：1521-3765

文摘

Tetraphenylethylene (TPE) and its derivatives are the most typical and most widely studied organic compounds showing aggregation-induced emission (AIE). Due to their propeller-like structures, V-like clefts exist between the aryl rings, which make them promising host compounds. However, such a possibility is seldom explored. Herein, it is reported that TPE derivatives bearing two or four pyridine rings at the para positions of the phenyl rings (TPE-Pys) can selectively include triangular (Δ-like) m-phthalic acid from a mixture of o-, m-, and p-phthalic acids due to their shape complementary to form host–guest co-crystals, which showed redder emission than the TPE-Pys themselves. The emission of co-crystals 1–5 could be reversibly switched between yellow and red by alternating exposure to HCl and ammonia vapor. The host–guest co-crystals not only exhibited great potential for selectively recognizing and separating m-phthalic acid and as multicolor emission materials, but are also suitable for use as secret ink due to their reversible color change on varying the host–guest interactions.