Photoinduced reaction of excited triplet 9,10-anthraquinone quenched by antioxidant vitamin C

被引：0
|
作者：
Chen, Sha [1 ]
Cao, Xian-Jun [1 ]
Luo, Yi [1 ]
Zhu, Guang-Lai [1 ]
Xu, Xin-Sheng [1 ]
机构：
[1] Anhui Normal Univ, Inst Atom & Mol Phys, Wuhu 241000, Peoples R China
来源：
JOURNAL OF ATOMIC AND MOLECULAR SCIENCES | 2014年 / 5卷 / 03期
基金：
中国国家自然科学基金;
关键词：
9,10-anthraquinone; Vitamin C; time-resolved electron paramagnetic resonance (TR-EPR); transient absorptive spectrum; chemically induced dynamic electron polarization (CIDEP);
D O I：
10.4208/jams.031814.061714a
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
The quenching of the photoinduced excited triplet of 9,10-anthraquinone (3AQ*) by Vitamin C (VC) has been studied in ethylene glycol-water (EG-H2O, EG/ H2O= 9/1, v/v) homogeneous by using time-resolved electronic paramagnetic resonance (TR-EPR) and laser flash photolysis techniques. According to the chemically induced dynamic electron polarization (CIDEP) and transient absorptive spectra, the reaction intermediates and the reaction mechanism have been analyzed. The rate constant for the quenching of excited triplet (3)AQ* by VC has been measured. The results indicate that (3)AQ* can capture hydrogen atom not only from ethylene glycol molecule but also from VC. The strong CIDEP signal of VC monoanion radical indicates that the quenching of VC to (3)AQ* is obvious. The rate for the quenching of (3)AQ(*) by VC is nearly diffusion-controlled.
引用
收藏
页码：238 / 246
页数：9
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