Ni Nanoparticles Stabilized by Poly(Ionic Liquids) as Chemoselective and Magnetically Recoverable Catalysts for Transfer Hydrogenation Reactions of Carbonyl Compounds. Issue 6 (5th February 2016)

• Record Type: Journal Article
• Authors: Vijayakrishna, Kari; Charan, K. T. Prabhu; Manojkumar, Kasina; Venkatesh, Sadhana; Pothanagandhi, Nellepalli; Sivaramakrishna, Akella; Mayuri, Pinapeddavari; Kumar, Annamalai Senthil; Sreedhar, B.
• Is Part Of: ChemCatChem. Volume 8:Issue 6(2016)
• Page Start: 1139
• Page End: 1145
• Publication Date: 2016-02-05
• Subjects: chemoselectivity -- imidazolium -- nickel nanoparticles -- poly(ionic liquids) -- stabilization; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201501313
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Imidazolium‐based poly(ionic liquids) with hydroxide as the counter anion were employed to prepare stable aqueous dispersion of Ni nanoparticles. The synthesized poly(ionic liquid) stabilized Ni nanoparticles (PIL‐Ni‐NPs) were characterized by thermogravimetric analysis (TGA), vibrating sample magnetometry (VSM), powder XRD, TEM, Brunauer–Emmett–Teller (BET) surface area measurements, X‐ray photoelectron spectroscopy (XPS), EPR, and UV/Vis spectroscopy. The PIL‐Ni‐NPs possess good catalytic activity towards transfer hydrogenation (TH) reactions of carbonyl compounds to their alcohol derivatives, in isopropanol at 80 °C in the absence of any additional base. This catalyst system chemoselectively reduces only the carbonyl group of α, β unsaturated carbonyl compounds. The magnetically separable PIL‐Ni‐NPs were recycled and reused for further TH reactions. Abstract : Poly(ionic liquid) support : Nickel nanoparticles (NPs) were successfully synthesized by using imidazolium‐based poly(ionic liquids) as stabilizing agents. The stabilized NPs were used as catalysts for the chemoselective reduction of α, β‐unsaturated carbonyl compounds. The NPs are magnetically separable, recyclable, and reusable.