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Photosynthesis Research

, Volume 95, Issue 2–3, pp 363–371 | Cite as

Mimicking the photosynthetic system with strong hydrogen bonds to promote proton electron concerted reactions

  • Isamu Kinoshita
  • Hideki Hashimoto
  • Takanori Nishioka
  • Riichi Miyamoto
  • Naoto Kuwamura
  • Yuki Yoshida
Regular Paper

Abstract

A Copper(2+) complex with a CuII–C bond containing sp3 configuration was used to investigate the role of strong hydrogen bonds in proton coupled electron transfer (PCET) reactions. The only example of a CuII–C system realized so far is that using tris-(pyridylthio)methyl (tptm) as a tetradentate tripodal ligand. Using this ligand, [CuF(tptm)] and [Cu(tptm)(OH)] have been prepared. The former complex forms supra-molecular arrays of layers of the complex between which hydroquinone is intercalated in the crystalline phase. This hydroquinone intercalation crystal was prepared via the photochemical conversion of quinone during the crystallization process. This conversion reaction probably involves a proton coupled electron transfer process. The nuclear magnetic resonance spectroscopic analysis of the reaction mixture shows the presence of Cu(III) during the conversion reaction. These results strongly suggest the presence of the molecular aggregate of the [CuF(tptm)] complex, water and quinone in the solution phase during the quinone to hydroquinone conversion. The presence of this type of aggregate requires a strong hydrogen bond between the [CuF(tptm)] complex and water. The presence of this particular hydrogen bond is a unique character of such a complex that has the CuII–C bond. This complex is used as a model for photosynthetic water splitting since the photoconversion of quinone to hydroquinone also involves the production of oxygen from water.

Keywords

Proton coupled electron transfer Quinone hydroquinone conversion Copper complex 

Abbreviation

PCET

Proton coupled electron transfer

QH2

Hydroquinone

tptmH

Tris-(pyridylthio)methane

tptm

Tris-(pyridylthio)methyl

OFF

Offset-face-to-face

EF

Edge-to-face

NHE

Normal hydrogen electrode

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Isamu Kinoshita
    • 1
  • Hideki Hashimoto
    • 1
  • Takanori Nishioka
    • 1
  • Riichi Miyamoto
    • 1
  • Naoto Kuwamura
    • 1
  • Yuki Yoshida
    • 1
  1. 1.Graduate School of ScienceOsaka-City UniversityOsakaJapan

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