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Helical folding of poly(naphthalenecarboxamide) in apolar solvent

Authors

  • Koichiro Mikami,

    1. Advanced Elements Chemistry Research Team, RIKEN-ASI, Wako-shi, Saitama, 351-0198, Japan
    Current affiliation:
    1. Advanced Elements Chemistry Research Team, RIKEN-ASI, Wako-shi, Saitama 351-0198, Japan
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  • Tsutomu Yokozawa

    Corresponding author
    1. Department of Material and Life Chemistry, Kanagawa University, Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
    • Department of Material and Life Chemistry, Kanagawa University, Rokkakubashi, Kanagawa-ku, Yokoyama 221-8686, Japan
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Abstract

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Helical folding of poly(naphthalenecarboxamide)s with aliphatic side chains in hydrophobic solvents is investigated. The CD spectra of the polyamide showed a predominant left-handed helical structure in chloroform, THF, and cyclohexane. Furthermore, the sergeants and soldiers experiment in cyclohexane showed a clear chiral amplification. These results indicate that the helical structure was stabilized by an intramolecualr self-association based on the solvophobic effect, and that there is cooperativity between the monomer units constituting the helical structure.

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