Görner Helmut
Max-Planck-Institut für Bioanorganische Chemie, D-45413 Mülheim an der Ruhr, Germany.
Photochem Photobiol. 2006 Jan-Feb;82(1):71-7. doi: 10.1562/2005-05-25-RA-540.
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.
研究了二甲基硫醚（DMS）和二甲基亚砜（DMSO）对1,4 - 苯醌（BQ）、1,4 - 萘醌（NQ）、9,10 - 蒽醌（AQ）及其几种衍生物在乙腈/水中光反应的影响。观察到醌的三重态被猝灭，对于大多数醌与DMS的反应，速率常数接近扩散控制极限，而与DMSO反应时速率常数较低。检测到了通过硫向三重态醌的电子转移产生的半醌自由基阴离子（Q * - ）。对于DMS和DMSO，Q * - 的产率相似，对于BQ和NQ通常较低，对于AQ较高，对于四氯苯醌则最高。讨论了特定猝灭剂浓度以及醌结构和氧化还原电位对时间分辨光化学性质的影响。
