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Syntheses, structure, redox and catalytic epoxidation properties of dioxomolybdenum(VI) complexes with Schiff base ligands derived from tris(hydroxymethyl)amino methane |
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| Authors: | Yan Sui, Xirui Zeng, Xiaoniu Fang, Xiangkai Fu, Yi&#x an Xiao, Li Chen, Menghua Li,Shu Cheng |
| Affiliation: | aCollege of Chemistry and Chemical Engineering, Jiangxi Province Key Laboratory of Coordination Chemistry, Jinggangshan University, Ji’an Jiangxi 343009, PR China bCollege of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China cCollege of Life Science, Jinggangshan University, Ji’an Jiangxi 343009, PR China dCollege of Education, Jinggangshan University, Ji’an Jiangxi 343009, PR China |
| Abstract: | Five kinds of dioxomolybdenum(VI) complexes with Schiff base ligands derived from tris(hydroxymethyl)amino methane are prepared and structurally characterized by X-ray crystallography, which reveals that these complexes adopt a distorted octahedral six-coordinate configuration formed by the tridentate Schiff base ligand, one coordinating water and two binding oxygen atoms. These complexes show good catalytic activities and selectivity in the epoxidation of cyclohexene with t-butylhydroperoxide, especially for complex 4, which could give a nearly 100% of epoxidation conversion and selectivity. Introduction of the electron-withdrawing group to the salicylidene ring of complex strongly increases the effectiveness of a catalyst, but decreases the redox stability of a complex. |
| Keywords: | Epoxidation Homogeneous catalysis Dioxomolybdenum(VI) complexes Tris(hydroxymethyl)amino methane Schiff base ligands |
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