Femtosecond Time-resolved Near-infrared Spectroscopy of Oligothiophenes and Polythiophene: Energy Location and Effective Conjugation Length of Their Low-lying Excited States

• Shunnosuke Okino

  Department of Chemistry, Faculty of Science, Gakushuin University

• Tomohisa Takaya

  Department of Chemistry, Faculty of Science, Gakushuin University

• Koichi Iwata

  Department of Chemistry, Faculty of Science, Gakushuin University

Abstract

The energies of low-lying singlet excited states of oligothiophenes, xT’s (x = 3 to 8), and polythiophene are determined using femtosecond time-resolved near-infrared spectroscopy. The energies are linearly correlated with the reciprocal number of the thiophene rings for the oligomers 3T to 7T. The linear relation is not observed for 8T, indicating that the effective conjugation is formed over no more than seven rings in the excited states. Transient absorption spectra of polythiophene show that its thiophene chains are composed of planar segments with five or six thiophene rings.

Journal

• Chemistry Letters

  Chemistry Letters 44 (8), 1059-1061, 2015-05-14

  Oxford University Press (OUP)

Details

• CRID: 1360846644035817856
• NII Article ID: 130005092604
• DOI: 10.1246/cl.150330
• ISSN: 13480715
• ISSN: 03667022
• Web Site: https://academic.oup.com/chemlett/article-pdf/44/8/1059/55644733/cl.150330.pdf
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