Photochromism Control of Salicylideneaniline Derivatives by Acid鈥揃ase Co-Crystallization

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• 作者：Kohei Johmoto ; Akiko Sekine ; Hidehiro Uekusa
• 刊名：Crystal Growth & Design
• 出版年：2012
• 出版时间：October 3, 2012
• 年：2012
• 卷：12
• 期：10
• 页码：4779-4786
• 全文大小：418K
• 年卷期：v.12,no.10(October 3, 2012)
• ISSN：1528-7505

文摘

Acid鈥揵ase co-crystallization has been used to control the photochromic reactivities of salicylideneaniline derivatives in co-crystals. The series of co-crystals N-salicylidene-3-carboxyaniline (1) with 2-aminopyridine (a), guanylthiourea (b), cytosine (c), 4,4鈥?bipyridyl (d), piperazine anhydrous (e), 1,3-di-o-tolylguanidine (f), and dibenzylamine (g) and N-salicylidene-4-carboxyaniline (2) with 4,4鈥?bipyridine (d) and N,N-dibenzylamine (g) have been synthesized. The weak photochromic compound 1 becomes nonphotochromic or strongly photochromic in the co-crystals and the nonphotochromic compound 2 becomes photochromic in the co-crystal 2g. The photochromic properties of compounds 1 and 2 change because of the conformational changes induced in the salicylideneaniline moieties in the crystal structure. The lifetimes of the colored species formed in the photochromic reaction are also affected by the changes in the environment around the molecule in the crystal. As shown in this study, acid鈥揵ase type co-crystallization may be a promising method to control the photochromic reactivities of salicylideneaniline derivatives.