Nasim Tadayonpour - Department of chemistry, Science and research branch, Islamic Azad University, Tehran, Iran
Saeed Rayati - Department of Chemistry, K.N. Toosi University of Technology, Tehran, Iran
Moayad Hossaini Sadr - Department of chemistry, Science and research branch, Islamic Azad University, Tehran, Iran
Karim Zare - Department of chemistry, Science and research branch, Islamic Azad University, Tehran, Iran

Two cis-dioxomolybdenum(VI) complexes involving Schiff-base ligands bis (2,4-dihydroxy acetophenone)-1,2-cyclohexyl diimine (H2L1) and bis (2,4-dihydroxy acetophenone)-1,2-propyl diimine (H2L2) and their six-coordinated cis-dioxomolybdenum(VI) complexes [MoO2LX (X=1,2)] were obtained under ultrasonic irradiation. Then MoO2L1,2 complexes were covalently grafted to the multiwalled carbon nanotubes which is chemically modified (MoO2L1,2@MWCNT) and were characterized by elemental analyses and spectroscopic technique (IR, (1H,13C{1H}) NMR and UV–vis). The size distribution of the nanoparticles was measured by Scanning Electron Microscope (SEM) and Dynamic Light Scattering (DLS) and MoO2L1,2@MWCNT also were characterized by IR spectroscopy, Transmission Electron Microscopy (TEM) and X-ray diffraction (XRD). Heterogeneous selective oxidation of olefins with tert-butyl hydroperoxide (TBHP) catalyzed by MoO2L1 and MoO2L2 led to the formation of corresponding epoxides as the sole product with a yield of 75% and 100% respectively. Also green and heterogeneous oxidation of sulfides catalyzed by MoO2L1,2 and MoO2L1,2@MWCNT nanocatalysts are studied in one hour at room temperature. The MoO2L1,2@MWCNT catalysts represent higher selectivity and recycling towards sulfides which indicated that immobilization of catalysts on MWCNTs can enhance the stability and consequently reusability of them.

Cyclooctene Epoxidation, Green oxidation, Heterogeneous Catalysis, Molybdenum Schiff base, Nanocatalyst, Sulfides