Synthesis,Characterization and Liquid Phase Oxidation of Cyclohexane with Hydrogen Peroxide over Oxovanadium(IV)Schiff-base Tetradendate Complex Covalently Anchored to Multi-Wall Carbon Nanotubes(MWNTs)

摘要

The chemical modification of multi-wall carbon nanotubes(MWNTs)is an emerging area in material science.In the present study,hydroxyl functionalized oxovanadium(IV)Schiff-base;N,N'-bis(4-hydroxysalicylidene)-ethylene-l,2-diamineoxovanadium(IV),[VO((OH)2-salen)];has been covalently anchored on modified MWNTs.The new modified MWNTs([VO((OH)2-salen)]-MWNTs])have been characterized by transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron(XPS),UV-Vis,Diffuse reflectance(DRS),FT-IR spectroscopy and elemental analysis.The analytical data indicated a composition corresponding to the mononuclear complex of tetradentate Schiff-base ligand.The characterization of the data showed the absence of extraneous complex,retention of MWNTs and covalently anchored on modified MWNTs.Liquid-phase oxidation of cyclohexane with H2O2 to a mixture of cyclohexanone,cyclohexanol and cyclohexane-1,2-diol in CH3CN have been reported using oxovanadium(IV)Schiff-base complex covalently anchored on modified MWNTs as catalysts.This catalyst is more selective toward cyclohexanol formation.