Dual ligands manganese complexes based on benzene sulfonic acid and 2,2'-bipyridine:Structure and catalytic properties and mechanism in Mannich reaction
Two supramolecular complexes of[Mn2(2,2'-bipy)4(H2O)Cl3](L1)·6H2O(1)and[Mn(2,2'-bipy)2(H2O)Cl](L2)·3H2O(2)(L1-=p-methylbenzenesulfonate anion,L2-=m-nitrobenzenesulfonate anion,2,2'-bipy=2,2'-bipyridine)were synthesized by solvothermal method.The complexes were characterized by single-crystal X-ray diffraction,infrared spectroscopy,thermogravimetric analysis,and nitrogen adsorption-desorption test.Using the Mannich reac-tion as a probe,the catalytic properties of the two complexes were studied,and the effects of the structure of the com-plexes on their catalytic properties were analyzed by comparing the results of scanning electron microscopy and pow-der X-ray diffraction.Finally,density functional theory was used to predict the active sites of the complexes,and X-ray photoelectron spectroscopy was used to prove the activation of the active sites.Then the mechanism of Mannich reaction catalyzed by the complexes was clarified.CCDC:2264043,1;2264042,2.
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