研究目的
Investigating the finely controlled circularly polarized luminescence (CPL) of a mechano-responsive supramolecular polymer based on a tetraphenylethene core with L- or D-alanine branch side chains in solution state by tuning mechanical stimulus.
研究成果
The study successfully demonstrated CPL supramolecular polymerization based on a tetraphenylethene core bearing alanine moieties by tuning the rotational speed. The dissymmetry factors of the CPL signals were controlled by the external mechanical stimulus, providing a distinctive insight into the design of functional chiroptical living supramolecular polymers.
研究不足
The study is limited to the solution state and specific mechanical stimuli (rotational speed). The effect of other external stimuli like pressure and light was not explored. The study also did not investigate the inversion of helicity by external stimulus due to the steric hindrance effect of the chiral center.
1：Experimental Design and Method Selection:
The study involved the design of molecules L-1, D-1, and 2 for supramolecular polymerization based on a tetraphenylethene core with hydrogen-bonding moieties and long alkyl chains. The AIE characteristics with external stimulus were investigated.
2：Sample Selection and Data Sources:
L-1 and D-1 were synthesized with L- or D-alanine branch side chains. Compound 2 was prepared as a reference to study the role of chiral moiety in CPL supramolecular polymerization.
3：List of Experimental Equipment and Materials:
Absorption and luminescence spectra were observed using a constant clockwise rotational speed in THF. AFM was used to observe morphologies of supramolecular polymers.
4：Experimental Procedures and Operational Workflow:
The luminescence and CD spectral changes were observed under different rotational speeds. The mechanical stimulus was applied by tuning the rotational speed from 200 to 1,000 rpm.
5：Data Analysis Methods:
The luminescence dissymmetry factor (glum) was calculated to evaluate the magnitude of CPL. The CD and CPL signals were analyzed to understand the chiral supramolecular polymerization.
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