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

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

Transient circular dichroism (TR-CD) spectra of (P)- and (M)-hexahelicenes (HHs) in the excited triplet state, (P)- and (M)-3HH*, 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...

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Bibliographic Details
Published in:Chemistry letters Vol. 48; no. 4; pp. 357 - 360
Main Authors: Kuronuma, Makoto, Sato, Takehito, Araki, Yasuyuki, Mori, Tadashi, Sakamoto, Seiji, Inoue, Yoshihisa, Ito, Osamu, Wada, Takehiko
Format: Journal Article
Language:English
Published: Tokyo The Chemical Society of Japan 05-04-2019
Chemical Society of Japan
Subjects:
Atomic energy levels
Cotton
Dichroism
Domains
Toluene
Chiroptical properties
Transient spectrum
Excited state
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Summary:Transient circular dichroism (TR-CD) spectra of (P)- and (M)-hexahelicenes (HHs) in the excited triplet state, (P)- and (M)-3HH*, 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)-3HH* obtained were mirror-imaged, exhibiting strong positive and negative Cotton effect, respectively, of |Δε| = 55 M−1 cm−1 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.
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.190012