期刊
CHEMICAL PHYSICS LETTERS
卷 472, 期 1-3, 页码 85-89出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2009.02.080
关键词
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A hybrid [SiO2-GA] material has been synthesized by grafting Gallic acid (3,4,5-trihydroxybenzoic acid, GA) on SiO2 via formation of amide bonds between amine groups on aminopropyl-silica and the carboxyl group of GA. The spatial fixation of GA prevents polymerization effects. EPR spectroscopy shows that GA radicals on [SiO2-GA] show remarkable stability, comparable to that previously observed only for radicals in biological matrices on in soil organic matter. EPR reveals a bundle-like organization of the GA molecules on [SiO2-GA] material. The relation of these factors to the enhanced radical stability is discussed. (C) 2009 Elsevier B. V. All rights reserved.
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