A Diprotonated Porphyrin as an Electron Mediator in Photoinduced Electron Transfer in Hydrogen-Bonded Supramolecular Assemblies

Wataru Suzuki, Hiroaki Kotani, Tomoya Ishizuka, Masaki Kawano, Hayato Sakai, Taku Hasobe, Kei Ohkubo, Shunichi Fukuzumi, Takahiko Kojima

研究成果: Article査読

2 被引用数 (Scopus)

抄録

We have successfully constructed hydrogen-bonded supramolecular assemblies based on a diprotonated saddle-distorted porphyrin (H4DPP2+) and redox-active molecules bearing a carboxylate group, such as a RuII polypyridyl complex (RuIICOO-) that can act as an electron donor and a benzyl viologen derivative (BV2+COO-) that can act as an electron acceptor. Formation of supramolecular assemblies of H4DPP2+ with RuIICOO- (H4DPP2+(RuIICOO-)2 and H4DPP2+(RuIICOO-)(Cl-)) and BV2+COO- (H4DPP2+(BV2+COO-)2) was confirmed in acetone by 1H NMR measurements, CSI-TOF-MS, and X-ray crystallographic analysis. The photodynamics of H4DPP2+(RuIICOO-)2 and H4DPP2+(BV2+COO-)2 was elucidated by femto-, pico-, and nanosecond time-resolved transient absorption spectroscopy. In H4DPP2+(RuIICOO-)2, intrasupramolecular photoinduced electron transfer (ET) occurred from the RuII center to the singlet excited state of H4DPP2+ to afford an ET state involving one-electron-reduced H4DPP•+ and the corresponding one-electron-oxidized RuIII complex with the lifetime of 150 ps. On the other hand, in the presence of an external electron donor, intermolecular photoinduced ET occurred from an electron donor to the triplet excited state of H4DPP2+(BV2+COO-)2 to afford H4DPP•+, following intrasupramolecular thermal ET proceeded from H4DPP•+ to BV2+COO- to form H4DPP2+(BV•+COO-)(BV2+COO-) with the lifetime of 1.1 ms. Thus, H4DPP2+ can act as an electron mediator in hydrogen-bonded supramolecular assemblies. This is the first example of porphyrins as a photosensitizer and an electron mediator in hydrogen-bonded ET systems.

本文言語English
ページ(範囲)11529-11538
ページ数10
ジャーナルJournal of Physical Chemistry C
123
18
DOI
出版ステータスPublished - 2019 5 9

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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