Sodium ion effect on photoinduced electron transfer of porphyrin-crown ether-affixed quaterthiophene-[60]fullerene triad as a gated molecular switch

Yasuyuki Araki, Huimin Zhang, Osamu Ito, Takuro Oike, Tomoyuki Kurata, Kazuo Takimiya, Tetsuo Otsubo, Yoshio Aso

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A porphyrin-quaterthiophene-fullerene triad, in which the center of the quaterthiophene spacer is additionally bridged with a crown ether chain in a sash manner (abbreviated as H2P-(2T(crown)2T)-CM), has been newly synthesized. Photoinduced charge-separation (CS) and charge-recombination processes in the absence and presence of Na+ have been investigated by time-resolved fluorescence and transient absorption spectroscopic methods. Upon photo-excitation of H2P-(2T(crown)2T)-C60 in benzonitrile, CS via 1H2P* generating H 2P*+-2T(crown)2T-C60*- took place, followed by a hole shift to a more energetically stable H 2P-(2T(crown)2T)*+-C60* -. In the presence of Na+, such CS process was completely suppressed by the formation of the Na+-inclusion complex H 2P-(2T(crown-Na+)2T)-C60. Extraction of Na + with the external 15-crown-ether-5 recovered the photoinduced CS process. This result indicates that H2P-(2T(crown)2T)-C60) is an unique photo-switchable system, because (2T(crown)2T) acts as ion-responsible molecular wire. Copyright The Electrochemical Society.

Original languageEnglish
Title of host publicationFullerenes, Nanotubes, and Carbon Nanostructures
Pages51-62
Number of pages12
Edition12
DOIs
Publication statusPublished - 2007 Dec 1
Event209th ECS Meeting - Denver, CO, United States
Duration: 2006 May 72006 May 12

Publication series

NameECS Transactions
Number12
Volume2
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other209th ECS Meeting
CountryUnited States
CityDenver, CO
Period06/5/706/5/12

ASJC Scopus subject areas

  • Engineering(all)

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    Araki, Y., Zhang, H., Ito, O., Oike, T., Kurata, T., Takimiya, K., Otsubo, T., & Aso, Y. (2007). Sodium ion effect on photoinduced electron transfer of porphyrin-crown ether-affixed quaterthiophene-[60]fullerene triad as a gated molecular switch. In Fullerenes, Nanotubes, and Carbon Nanostructures (12 ed., pp. 51-62). (ECS Transactions; Vol. 2, No. 12). https://doi.org/10.1149/1.2408952