S2 Fluorescence from [26]Hexaphyrin Dianion

Won Young Cha; Woojae Kim; Hirotaka Mori; Tomoki Yoneda; Atsuhiro Osuka; Dongho Kim

doi:10.1021/acs.jpclett.7b01799

S₂ Fluorescence from [26]Hexaphyrin Dianion

Won Young Cha, Woojae Kim, Hirotaka Mori, Tomoki Yoneda, Atsuhiro Osuka, Dongho Kim

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

S₂ fluorescence from meso-hexakis(pentafluorophenyl)-substituted [26]hexaphyrin dianion was observed as the first example of expanded porphyrins despite its large molecular size and small HOMO-LUMO gap. The population kinetics among S₂, S₁, and S₀ states have been studied by using femtosecond time-resolved absorption and fluorescence spectroscopies. Broad-band fluorescence upconversion spectroscopy allowed for simultaneous observation of S₂ fluorescence decay in the visible region and S₁ fluorescence rise in the NIR region, both with a time constant of 0.22 ps. The transient absorption spectroscopy revealed the presence of a direct decay path from the S₂ state to the S₀ state. The observation of S₂ fluorescence from highly conjugated molecular systems is quite rare, and S₂ fluorescence beyond 700 nm is also quite rare.

Original language	English
Pages (from-to)	3795-3799
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	8
Issue number	16
DOIs	https://doi.org/10.1021/acs.jpclett.7b01799
Publication status	Published - 2017 Aug 17

Bibliographical note

Funding Information:
The work at Yonsei University was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2016R1E1A1A01943379). The work at Kyoto was supported by Grants-in-Aid from JSPS (Nos. 25220802 (Scientific Research (S)), 16K13952 (Exploratory Research)).

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Physical and Theoretical Chemistry

Access to Document

10.1021/acs.jpclett.7b01799

Cite this

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title = "S2 Fluorescence from [26]Hexaphyrin Dianion",

abstract = "S2 fluorescence from meso-hexakis(pentafluorophenyl)-substituted [26]hexaphyrin dianion was observed as the first example of expanded porphyrins despite its large molecular size and small HOMO-LUMO gap. The population kinetics among S2, S1, and S0 states have been studied by using femtosecond time-resolved absorption and fluorescence spectroscopies. Broad-band fluorescence upconversion spectroscopy allowed for simultaneous observation of S2 fluorescence decay in the visible region and S1 fluorescence rise in the NIR region, both with a time constant of 0.22 ps. The transient absorption spectroscopy revealed the presence of a direct decay path from the S2 state to the S0 state. The observation of S2 fluorescence from highly conjugated molecular systems is quite rare, and S2 fluorescence beyond 700 nm is also quite rare.",

author = "Cha, {Won Young} and Woojae Kim and Hirotaka Mori and Tomoki Yoneda and Atsuhiro Osuka and Dongho Kim",

note = "Funding Information: The work at Yonsei University was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2016R1E1A1A01943379). The work at Kyoto was supported by Grants-in-Aid from JSPS (Nos. 25220802 (Scientific Research (S)), 16K13952 (Exploratory Research)). Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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doi = "10.1021/acs.jpclett.7b01799",

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AU - Cha, Won Young

AU - Kim, Woojae

AU - Mori, Hirotaka

AU - Yoneda, Tomoki

AU - Osuka, Atsuhiro

AU - Kim, Dongho

N1 - Funding Information: The work at Yonsei University was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (2016R1E1A1A01943379). The work at Kyoto was supported by Grants-in-Aid from JSPS (Nos. 25220802 (Scientific Research (S)), 16K13952 (Exploratory Research)). Publisher Copyright: © 2017 American Chemical Society.

PY - 2017/8/17

Y1 - 2017/8/17

N2 - S2 fluorescence from meso-hexakis(pentafluorophenyl)-substituted [26]hexaphyrin dianion was observed as the first example of expanded porphyrins despite its large molecular size and small HOMO-LUMO gap. The population kinetics among S2, S1, and S0 states have been studied by using femtosecond time-resolved absorption and fluorescence spectroscopies. Broad-band fluorescence upconversion spectroscopy allowed for simultaneous observation of S2 fluorescence decay in the visible region and S1 fluorescence rise in the NIR region, both with a time constant of 0.22 ps. The transient absorption spectroscopy revealed the presence of a direct decay path from the S2 state to the S0 state. The observation of S2 fluorescence from highly conjugated molecular systems is quite rare, and S2 fluorescence beyond 700 nm is also quite rare.

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