Reaction of the binucleating S-protected ligand precursors 2-(N,N-dimethylthiocarbamato)-5-methylisophthalaldehyde di-2′-hydroxy anil (I) and 2-(N,N-dimethylthiocarbamato)-5-methylisophthalaldehyde di-2′-hydroxy 5′-methyl anil (II) with
nickel(II) acetate tetrahydrate in the presence of pyrazole afforded the binuclear nickel(II) complexes [L
Ni2(pz)] (1) and [L
Ni2(pz)] (2), respectively. The complexes have been characterized by routine physicochemical
studies as well as by X-ray single crystal structure analysis. In both complexes, Ni(II) ions are doubly bridged by the thiophenolic sulfur of the pentadentate Schiff base ligand and a pyrazolate group. Efficient protocols for the oxidation of sulfides to sulfoxides with high selectivities,
catalyzed by binuclear μ-thiophenolato-μ-pyrazolatonickel(II) in the presence of urea hydrogen peroxide (UHP) were explored. We obtained predominantly the monooxygenated product. The resulting products are obtained in good to excellent yields within a reasonable time.
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Binuclear Ni(II) complexes;
single crystal X-ray diffraction study;
Document Type: Research Article
Chemistry Department, Sharif University of Technology, Tehran, Iran
Faculty of Science, Department of Chemistry, University of Maragheh, Maragheh, Iran
Department of Chemistry, University of Waterloo, Waterloo, Canada
January 2, 2016