Abstract
Abstract—Illumination with red light of degassed solutions of chlorophyll and benzoquinone in dry acetone does not result in quinone radical formation, even though the presence of quinone greatly enhances the photoproduction of chlorophyll cation radical at low temperatures. However, when small amounts of water (or alcohols) are added to this system, large benzoquinone anion radical electron spin resonance (ESR) signals are generated. The effects on the low‐temperature ESR signals of microwave power saturation, replacement of chlorophyll and quinone by their deuterated analogs, and replacement of H2O by D2O, lead to the suggestion that a one‐electron oxidation of water is occurring. Pheophytin and bacteriochlorophyll are shown to sensitize a similar photoreaction. These results could lead to new insights into the mechanism of oxygen formation in photosynthesis.
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