期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：1
页码：90-98
出版社：University of Mohammed Premier Oujda
摘要：A synthesis of functional N-donor tripodal pyrazolyl ligands: diethyl 1,1'-(1-phenylethylazanediyl)bis(methylene)bis(5-methyl-1H-pyrazole-3-carboxylate) L1 ; diethyl 1,1'-(4-acetylphenylazanediyl)bis(methylene)bis(5-methyl-1H-pyrazole-3-carboxylate) L2 and diethyl 1,1'-(4-hydroxy-6-methylpyrimidin-2-ylazanediyl)bis(methylene)bis(5-methyl-1H-pyrazole-3-carboxylate) L3 is reported. The substituents effect ofdivers bulkiness and electron donor/acceptor power that have been introduced to these tridentate molecules isvisualized by 1H and 13C NMR spectroscopy. Compounds L1 and L2 have been examined for their catalyticoxidative activities. The dioxygen complexes of copper (II) were generated in-situ by stirring copper salts andthe tridentate pyrazole ligands. It has been found that these compounds are able to oxidize catechol substrate tothe corresponding o-quinone with dioxygen at ambient condition. The best rate was given by the combinationL1+2CuSO4. The ligand structure and the nature of the anion salts of copper (II) have a significant effect on thecatalytic activity.
