Enhancement of the Quinoidal Character for Smaller [n]Cycloparaphenylenes Probed by Raman Spectroscopy

Authors

  • Dr. Mamoru Fujitsuka,

    Corresponding author
    1. The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
    • The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
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  • Takahiro Iwamoto,

    1. Institute for Chemical Research, Kyoto University, Uji 611-0011 (Japan)
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  • Dr. Eiichi Kayahara,

    1. Institute for Chemical Research, Kyoto University, Uji 611-0011 (Japan)
    2. CREST (Japan) Science and Technology Agency, Tokyo 102-0076 (Japan)
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  • Prof. Shigeru Yamago,

    1. Institute for Chemical Research, Kyoto University, Uji 611-0011 (Japan)
    2. CREST (Japan) Science and Technology Agency, Tokyo 102-0076 (Japan)
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  • Prof. Tetsuro Majima

    Corresponding author
    1. The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
    • The Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan), Fax: (+81) 6-6879-8499
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Abstract

original image

Quinoidal hoop-shaped macrocycles: Raman spectra of cycloparaphenylenes of different sizes are measured and compared with those of linear oligoparaphenylenes and theoretical calculations. In the cases of cycloparaphenylenes, peak positions of C[DOUBLE BOND]C/C[BOND]C stretches significantly depend on the size of the oligomer (see picture), indicating an enhancement of the quinoidal character of smaller cycloparaphenylenes.

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