Abstract
The transient absorption spectra and kinetics of excited triplet state of anthraquinone derivatives 2-anthraquinonesulfonatesodium (AQS) and 2-deoxythymidine (dT) have been investigated in CH3CN-H2O (97:3) using the time-resolved laser flash photolysis technique (KrF, 248 nm). The absorption spectra of dT radical cation and the radical anion of AQS have been observed. From dynamic and thermodyrnamic analysis, the mechanism of this transient reaction has been initially analysed.
Highlights
Quinones play central roles in aerobic respiration and energy-yielding photosynthesis [1]
The “strong sensitizer” 2-anthraquinonesulfonatesodium (AQS), has received much attention because of its relevance to some important photosensitizing effects induced by anthraquinones, phototendering of cellulosic materials
The transient absorption spectra and kinetics obtained from electron transfer oxidation of dT by triplet AQS indicated that the produced radical ion pairs, radical cations of dT and radical anion of AQS, were identified simultaneously
Summary
Quinones play central roles in aerobic respiration and energy-yielding photosynthesis [1]. The “strong sensitizer” 2-anthraquinonesulfonatesodium (AQS), has received much attention because of its relevance to some important photosensitizing effects induced by anthraquinones, phototendering of cellulosic materials. AQS is a strong sensitizer and for numerous investigations concerning on it [3,4,5], only a few studies have been performed on the reaction of AQS with biological substances [5]. We report that time-resolved spectroscopic and kinetic evidences for the interaction of AQS with dT in CH3CN-H2O solvent mixture were investigated using KrF laser flash photolysis. The transient absorption spectra and kinetics obtained from electron transfer oxidation of dT by triplet AQS indicated that the produced radical ion pairs, radical cations of dT and radical anion of AQS, were identified simultaneously
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