Journal
POLYMER CHEMISTRY
Volume 6, Issue 23, Pages 4230-4239Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5py00496a
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Funding
- National Nature Science Foundation of China [21374072, 21374068]
- Ministry of Science and Technology of China [2011DFA50530]
- Nature Science Key Basic Research of Jiangsu Province for Higher Education [12KJA150007]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Soochow University
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Here we designed a trans-cis photoisomerizable achiral side chain azobenzene-containing polymer, poly( 6-[4-(4-methoxyphenylazo) phenoxy] hexyl methacrylate) (PAzoMA), to investigate the possibility of transferring chirality of chiral solvent molecules to polymers. Preferred chirality in supramolecularly assembled trans-azobenzene units of PAzoMA is successfully induced by limonene chirality. This chiral solvation induced chirality arises from superstructural chirality of well-assembled achiral azobenzene units in polymer side chains. The intense bisignated circular dichroism (CD) signals in the UV-vis region disappeared when trans-cis photoisomerization of PAzoMA occurred with 365 nm light irradiation. The polymer aggregate solution shows the CD-silent state when the cis-PAzoMA solution is subjected to 436 nm light irradiation. The intense CD signals with a similar to 40 nm red-shift were recovered by heating the polymer aggregate solution to 60 degrees C and keeping it at this temperature for 40 min, then cooling it down to room temperature. The successful construction of a reversible chiral-achiral switch based on an achiral azobenzene-containing side chain polymer will open a new approach for production of chiroptical materials.
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