In Vitro Solar Conversion after the Primary Light Reaction in Photosynthesis. Reversible Photogalvanic Effects of Chlorophyll-Quinhydrone Half-Cell Reactions

Francis K. Fong, Nicholas Winograd

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Abstract

In this publication, we report the observation of photogalvanic effects arising from chlorophyll a-quinhydrone (Q: H2Q, 1:1) half-cell reactions. Platinum electrodes have been employed. In the presence of light, a photocurrent is developed as Chl a aggregates presumably undergo a charge-transfer interaction that results in the creation of a p-type semiconductor film. The observed photopotential at the Pt-Chl a electrode is positive. When the light is turned off, the half-cells regress toward the preillumination conditions, and a reverse current is observed. The spectral response of the photogalvanic effect has been determined. It has been found that a distribution of Chl a-H2O aggregates contribute to the observed photocurrent. The in vitro solar conversion results are discussed in terms of the recently proposed primary light reaction model of photosynthesis.

Original languageEnglish (US)
Pages (from-to)2287-2289
Number of pages3
JournalJournal of the American Chemical Society
Volume98
Issue number8
DOIs
StatePublished - Apr 1 1976

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Photosynthesis
Chlorophyll
Photocurrents
Light
Electrodes
Semiconductors
Platinum
Charge transfer
Observation
Semiconductor materials
In Vitro Techniques
quinhydrone

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

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abstract = "In this publication, we report the observation of photogalvanic effects arising from chlorophyll a-quinhydrone (Q: H2Q, 1:1) half-cell reactions. Platinum electrodes have been employed. In the presence of light, a photocurrent is developed as Chl a aggregates presumably undergo a charge-transfer interaction that results in the creation of a p-type semiconductor film. The observed photopotential at the Pt-Chl a electrode is positive. When the light is turned off, the half-cells regress toward the preillumination conditions, and a reverse current is observed. The spectral response of the photogalvanic effect has been determined. It has been found that a distribution of Chl a-H2O aggregates contribute to the observed photocurrent. The in vitro solar conversion results are discussed in terms of the recently proposed primary light reaction model of photosynthesis.",
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AB - In this publication, we report the observation of photogalvanic effects arising from chlorophyll a-quinhydrone (Q: H2Q, 1:1) half-cell reactions. Platinum electrodes have been employed. In the presence of light, a photocurrent is developed as Chl a aggregates presumably undergo a charge-transfer interaction that results in the creation of a p-type semiconductor film. The observed photopotential at the Pt-Chl a electrode is positive. When the light is turned off, the half-cells regress toward the preillumination conditions, and a reverse current is observed. The spectral response of the photogalvanic effect has been determined. It has been found that a distribution of Chl a-H2O aggregates contribute to the observed photocurrent. The in vitro solar conversion results are discussed in terms of the recently proposed primary light reaction model of photosynthesis.

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