Volume 127, Issue 43 pp. 12902-12906
Zuschrift

Excited-State Dynamic Planarization of Cyclic Oligothiophenes in the Vicinity of a Ring-to-Linear Excitonic Behavioral Turning Point

Kyu Hyung Park

Kyu Hyung Park

Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

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Dr. Pyosang Kim

Dr. Pyosang Kim

Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

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Woojae Kim

Woojae Kim

Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

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Dr. Hideyuki Shimizu

Dr. Hideyuki Shimizu

Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397 (Japan)

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Dr. Minwoo Han

Dr. Minwoo Han

Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, Seoul 120-749 (Korea)

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Prof. Dr. Eunji Sim

Corresponding Author

Prof. Dr. Eunji Sim

Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, Seoul 120-749 (Korea)

Eunji Sim, Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, Seoul 120-749 (Korea)

Masahiko Iyoda, Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397 (Japan)

Dongho Kim, Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

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Prof. Dr. Masahiko Iyoda

Corresponding Author

Prof. Dr. Masahiko Iyoda

Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397 (Japan)

Eunji Sim, Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, Seoul 120-749 (Korea)

Masahiko Iyoda, Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397 (Japan)

Dongho Kim, Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

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Prof. Dr. Dongho Kim

Corresponding Author

Prof. Dr. Dongho Kim

Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

Eunji Sim, Department of Chemistry and Institute of Nano-Bio Molecular Assemblies, Yonsei University, Seoul 120-749 (Korea)

Masahiko Iyoda, Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Tokyo 192-0397 (Japan)

Dongho Kim, Department of Chemistry and Spectroscopy Laboratory for Functional π-Electronic Systems, Yonsei University, Seoul 120-749 (Korea)

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First published: 31 August 2015
Citations: 9

Abstract

Excited-state dynamic planarization processes play a crucial role in determining exciton size in cyclic systems, as reported for π-conjugated linear oligomers. Herein, we report time-resolved fluorescence spectra and molecular dynamics simulations of π-conjugated cyclic oligothiophenes in which the number of subunits was chosen to show the size-dependent dynamic planarization in the vicinity of a ring-to-linear behavioral turning point. Analyses on the evolution of the total fluorescence intensity and the ratio between 0–1 to 0–0 vibronic bands suggest that excitons formed in a cyclic oligothiophene composed of six subunits fully delocalize over the cyclic carbon backbone, whereas those formed in larger systems fail to achieve complete delocalization. With the aid of molecular dynamics simulations, it is shown that distorted structures unfavorable for efficient exciton delocalization are more easily populated as the size of the cyclic system increases.

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