Year: 2014
Author: Sha Chen, Xian-Jun Cao, Yi Luo, Guang-Lai Zhu, Xin-Sheng Xu
Journal of Atomic and Molecular Sciences, Vol. 5 (2014), Iss. 3 : pp. 238–246
Abstract
The quenching of the photoinduced excited triplet of 9,10-anthraquinone $(^3AQ^*)$ by Vitamin C (VC) has been studied in ethylene glycol-water $(EG-H_2O, EG/H_2O=9/1, v/v)$ 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 $^3AQ^*$ by VC has been measured. The results indicate that $^3AQ^*$ 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 $^3AQ^*$ is obvious. The rate for the quenching of $^3AQ^*$ by VC is nearly diffusion-controlled.
You do not have full access to this article.
Already a Subscriber? Sign in as an individual or via your institution
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/jams.031814.061714a
Journal of Atomic and Molecular Sciences, Vol. 5 (2014), Iss. 3 : pp. 238–246
Published online: 2014-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 9
Keywords: 9 10-anthraquinone Vitamin C time-resolved electron paramagnetic resonance (TREPR)