Transfer of chirality from molecule to phase in self-assembled chiral block copolymers

Rong Ming Ho*, Ming-Chia Li, Shih Chieh Lin, Hsiao Fang Wang, Yu Der Lee, Hirokazu Hasegawa, Edwin L. Thomas

*Corresponding author for this work

Research output: Contribution to journalArticle

69 Scopus citations


Here, we report the mechanisms of chiral transfer at various length scales in the self-assembly of enantiomeric chiral block copolymers (BCPs*). We show the evolution of homochirality from molecular chirality into phase chirality in the self-assembly of the BCPs*. The chirality of the molecule in the BCP* is identified from circular dichroism (CD) spectra, while the handedness of the helical conformation in the BCP* is determined from a split-type Cotton effect in vibrational circular dichroism spectra. Microphase separation of the BCP* is exploited to form a helical (H*) phase, and the handedness of helical nanostructure in the BCP* is directly visualized from transmission electron microscopy tomography. As examined by CD and fluorescence experiments, significant induced CD signals and a bathochromic shift of fluorescence emission for the achiral perylene moiety as a chemical junction of the BCPs* can be found while the concentration of the BCPs* in toluene solution is higher than the critical micelle concentration, suggesting a twisting and shifting mechanism initiating from the microphase-separated interface of the BCPs* leading to formation of the H* phase from self-assembly.

Original languageEnglish
Pages (from-to)10974-10986
Number of pages13
JournalJournal of the American Chemical Society
Issue number26
StatePublished - 4 Jul 2012

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