Journal
MACROMOLECULES
Volume 53, Issue 15, Pages 6288-6298Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.0c01140
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Funding
- China Postdoctoral Science Foundation [2016M602532, 2017T100646]
- National Natural Science Foundation of China [21574085]
- National Natural Science Foundation of Guangdong Province [2016A030312002, 2017A030313067, 2019KZDXM008]
- Science and Technology Plan of Shenzhen [JCYJ20180306174910791]
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Chiral polytriazole derivatives carrying terapheny-lethene (TPE) and L-phenylalanine were synthesized, which had a TPE backbone and a chiral L-phenylalanine pendant in common, but with the phenylalanine pendant in ester protected and deprotected carboxylic acid form, respectively. The deprotected carboxylic acid form was further added with chiral (1S,2S)- and (1R,2R)-cyclohexane-1,2-diamine (Chxn) to form a host-guest polymer system, respectively. The combination of luminescence and chirality in polymers was successful to endow them with CD, AIE, and CPL properties and the ability to self-assemble. The deprotected P(TPE-Phenylalanine) with (1S,2S)-Chxn added showed the best optical performance and formed the most regular helical assemblies, followed by the deprotected P(TPE-Phenyl-alanine), P(TPE-Phenylalanine), and (1R,2R)-Chxn added deprotected P(TPE-Phenylalanine). The chiral pendant groups helped chirality transfer from the side chain to the main chain by forming hydrogen bonding. Subtle changes in the pendant structure led to diverse intermolecular interactions, which caused significant changes in the optical properties and chiral self-assemblies of the polymers. With the pendant hydrolyzing from the ester to acid form, hydrogen bonding was considerably strengthened; with (1S,2S)-Chxn added, hydrogen bonding was further enhanced.
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