Transient Circular Dichroism Measurement of the Excited Triplet State of Pristine Hexahelicene in Solution at Room Temperature

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Author(s)

    • Kuronuma Makoto
    • Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
    • Sato Takehito
    • Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
    • Araki Yasuyuki
    • Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
    • Mori Tadashi
    • Department of Applied Chemistry, Graduated School of Engineering, Osaka University
    • Sakamoto Seiji
    • Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
    • Inoue Yoshihisa
    • Department of Applied Chemistry, Graduated School of Engineering, Osaka University
    • Ito Osamu
    • Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
    • Wada Takehiko
    • Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

Abstract

<p>Transient circular dichroism (TR-CD) spectra of (<i>P</i>)- and (<i>M</i>)-hexahelicenes (<b>HH</b>s) in the excited triplet state, (<i>P</i>)- and (<i>M</i>)-<sup>3</sup><b>HH</b>*, and their growth and decay behaviors in the µs time domains were recorded for the first time in toluene at room temperature, using an improved Kliger's method. The TR-CD spectra of (<i>P</i>)- and (<i>M</i>)-<sup>3</sup><b>HH</b>* obtained were mirror-imaged, exhibiting strong positive and negative Cotton effect, respectively, of |Δ<i>ε</i>| = 55 M<sup>−1</sup> cm<sup>−1</sup> for the lowest-energy band at 660 nm and additional sign-alternating less intense peaks in the higher energy region, the major features of which were well reproduced by the TD-DFT calculations at the UCAM-B3LYP/6-31G(d,p) level.</p>

Journal

  • Chemistry Letters

    Chemistry Letters 48(4), 357-360, 2019

    The Chemical Society of Japan

Codes

  • NII Article ID (NAID)
    130007624434
  • Text Lang
    ENG
  • ISSN
    0366-7022
  • Data Source
    J-STAGE 
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