Dioxomolybdenum(VI) complexes with thiosemicarbazone ligands as (pre)catalysts for olefin epoxidation (CROSBI ID 425267)
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Podaci o odgovornosti
Renka, Sanja
Vrdoljak, Višnja ; Agustin, Dominique
Pisk, Jana
engleski
Dioxomolybdenum(VI) complexes with thiosemicarbazone ligands as (pre)catalysts for olefin epoxidation
Three polynuclear dioxomolybdenum(VI) complexes [MoO2(5MeO-SalTSC-4-Ph)]n, [MoO2(5MeO-SalTSC-4- Me)]n and [{;MoO2(5-MeO-SalTSC)};·½CH3CN] n, two mononuclear [MoO2(5MeO-SalTSC-4-Me)(MeOH)] and [MoO2(5MeO-SalTSC)(MeOH)]·MeOH and hybrid organic-inorganic POM complex [MoO2(H5MeO- SalTSC-4Me)(CH3CN)]2Mo6O19 have been synthesized by the reaction of [MoO2(acac)2] and corresponding thiosemicarbazone ligand in 1:1 and 7:1 molar ratio, respectively. Mononuclear complexes were obtained from a methanolic solution, whereas polynuclear and POM hybrid complex from acetonitrile. Complexes were characterized by the IR spectroscopy, elemental and thermogravimetric analysis. Additionally, molecular and crystal structures of mononuclear complexes were determined by the single crystal X-ray diffraction. Catalytic activity of all complexes was tested in the solvent-free epoxidation of cis-cyclooctene, cyclohexene and (R)-limonene with TBHP as an oxidant and low catalyst loading (0.05 %).
molybdenum(VI) complexes, polyoxomolybdates, solvent-free epoxidation
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73
23.01.2019.
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Prirodoslovno-matematički fakultet, Zagreb
Zagreb