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    Solvent and Surface/Interface Effect on the Hierarchical Assemblies of Chiral Aggregation-Induced Emitting Molecules

    Year: 2019

    Journal: Langmuir, Volume 35, MAR 12, page 3805–3813

    Authors: Li, Bing Shi; Huang, Xuejiao; Li, Hongkun; Xia, Wenjuan; Xue, Shan; Xia, Qing; Tang, Ben Zhong

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21574085]; National Natural Science Foundation of Guangdong provinceNational Natural Science Foundation of Guangdong Province [2016A030312002, 2017A030313067]; Shenzhen Scientific Technology Research Program [JCYJ20170302143846672]

    The core of aggregation-induced emitting (ME) molecules was their aggregation behavior. It was, in essence, a self-assembly process driven by noncovalent interactions, which were governed not only by the chemical structures of the molecules but also by the conditions where the self-assemblies were formed. The self-assemblies of two AIE molecules, tetraphenylethene (TPE) derivatives carrying one valine attachment (TPE-Val) and two valine attachments (TPE-2Val), were studied. Both kinds of molecules self assembled into supramolecular helical fibers with different handedness upon the addition of poor solvent to their solution. However, when deposited on air/water interface, both kinds of molecules formed aligned elementary helical fibers instead of supramolecular fibers. The lateral solvophobic effect exerted by water molecules caused a shift of the original noncovalent balance between molecules and solvent; thus, the supramolecular helical assemblies were unraveled into aligned helical elementary fibers. Similar elementary assemblies were formed on the surface of 3-aminopropyl triethoxysilane-modified mica, confirming the lateral solvophobic effect on the self-assemblies of the molecules.
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