Determination of the structural features of a long-lived electron-transfer state of 9-mesityl-10-methylacridinium ion

Manabu Hoshino, Hidehiro Uekusa, Ayana Tomita, Shin Ya Koshihara, Tokushi Sato, Shunsuke Nozawa, Shin Ichi Adachi, Kei Ohkubo, Hiroaki Kotani, Shunichi Fukuzumi

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Abstract

Extensive efforts have been devoted to developing electron donor-acceptor systems that mimic the utilization of solar energy that occurs in photosynthesis. X-ray crystallographic analysis shows how absorbed photon energy is stabilized in those compounds by structural changes upon photoinduced electron transfer (ET). In this study, structural changes of a simple electron donor-acceptor dyad, 9-mesityl-10-methylacridinium cation (Acr +-Mes), upon photoinduced ET were directly observed by laser pump and X-ray probe crystallographic analysis. The N-methyl group in Acr + was bent, and a weak electrostatic interaction between Mes and a counteranion in the crystal (ClO 4) was generated by photoinduced ET. These structural changes correspond to reduction and oxidation due to photoinduced ET and directly elucidate the mechanism in Acr +-Mes for mimicking photosynthesis efficiently.

Original languageEnglish
Pages (from-to)4569-4572
Number of pages4
JournalJournal of the American Chemical Society
Volume134
Issue number10
DOIs
StatePublished - 14 Mar 2012

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