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Synthesis and characterization of two binuclear nickel(II) complexes of thiophenol-based "end-off" compartmental ligands and their application as catalysts for selective oxidation of sulfides
Khadir, N ; Sharif University of Technology | 2016
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- Type of Document: Article
- DOI: 10.1080/00958972.2015.1107723
- Publisher: Taylor and Francis Ltd , 2016
- Abstract:
- 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 [LINi2(pz)] (1) and [LIINi2(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 -thiophenolato - 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
- Keywords:
- Binuclear Ni(II) complexes ; Diffraction study ; Oxidation ; Single crystal X-ray ; Sulfide
- Source: Journal of Coordination Chemistry ; Volume 69, Issue 1 , 2016 , Pages 103-111 ; 00958972 (ISSN)
- URL: http://www.tandfonline.com/doi/abs/10.1080/00958972.2015.1107723?journalCode=gcoo20