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1 January 2006 Photoreactions of p-Quinones with Dimethyl Sulfide and Dimethyl Sulfoxide in Aqueous Acetonitrile
Helmut Görner
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Abstract

The effects of dimethyl sulfide (DMS) and dimethyl sulfoxide (DMSO) on the photoreactions of 1,4-benzoquinone (BQ), 1,4-naphthoquinone (NQ), 9,10-anthraquinone (AQ) and several derivatives in acetonitrile/water were studied. The observed triplet state of the quinones is quenched and the rate constant is close to the diffusion-controlled limit for reactions of most quinones with DMS and lower with DMSO. Semiquinone radical anions (Q·−) produced by electron transfer from sulfur to the triplet quinone were detected. For both DMS and DMSO the yield of Q·− is similar, being generally low for BQ and NQ, substantial for AQ and largest for chloranil. The specific quencher concentrations and the effects of quinone structure and redox potentials on the time-resolved photochemical properties are discussed.

Helmut Görner "Photoreactions of p-Quinones with Dimethyl Sulfide and Dimethyl Sulfoxide in Aqueous Acetonitrile," Photochemistry and Photobiology 82(1), 71-77, (1 January 2006). https://doi.org/10.1562/2005-05-25-RA-540
Received: 24 May 2005; Accepted: 19 July 2005; Published: 1 January 2006
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