Abstract
The paper is mainly focused on the induced circular dichroism (ICD) based on central-to-axial chirality transfer for direct chiral recognition and ee value detection of 1,2-diaminocyclohexane (1,2-DACH) enantiomers. A novel achiral polymer sensor with potential axial chirality feature is designed and synthesized. This conjugated polymer incorporating biphenol moiety can bind chiral 1,2-DACH substrates via intramolecular hydrogen-bonding interactions, which could result in the detectable exciton-coupled circular dichroism (CD) spectrum due to the chirality transfer from an enantiopure building block to a dynamically racemic 1,1′-biphenyl-2,2′-diol moiety in the polymer chain backbone. The linear regression analysis of ICD sensing shows an excellent agreement between CD intensity and concentration of chiral 1,2-DACH, which indicates this biphenol-based achiral polymer can be used as a chiral sensor for direct recognition and ee value detection of 1,2-DACH enantiomers by using ICD spectra of achiral polymer sensor.
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