Transient circular dichroism measurement of the excited triplet state of pristine hexahelicene in solution at room temperature

Makoto Kuronuma, Takehito Sato, Yasuyuki Araki, Tadashi Mori, Seiji Sakamoto, Yoshihisa Inoue, Osamu Ito, Takehiko Wada

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Transient circular dichroism (TR-CD) spectra of (P)- and (M)-hexahelicenes (HHs) in the excited triplet state, (P)- and (M)- 3 HH , 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 (P)- and (M)- 3 HH obtained were mirror-imaged, exhibiting strong positive and negative Cotton effect, respectively, of δϵ| = 55M -1 cm -1 for the lowest-energy band at 660nm 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.

Original languageEnglish
Pages (from-to)357-360
Number of pages4
JournalChemistry Letters
Volume48
Issue number4
DOIs
Publication statusPublished - 2019

Keywords

  • Chiroptical properties
  • Excited state
  • Transient spectrum

ASJC Scopus subject areas

  • Chemistry(all)

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