Journal
LANGMUIR
Volume 35, Issue 10, Pages 3805-3813Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b03358
Keywords
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Funding
- National Natural Science Foundation of China [21574085]
- National Natural Science Foundation of Guangdong province [2016A030312002, 2017A030313067]
- Shenzhen Scientific Technology Research Program [JCYJ20170302143846672]
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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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