Cross-Linked Polyamine from Imidazolium-Based Materials: A Simple Route to Useful Catalytic Materials
- Autori: Campisciano, V.; Salvo, A.; Liotta, L.; Spinella, A.; Giacalone, F.; Gruttadauria, M.
- Anno di pubblicazione: 2018
- Tipologia: Articolo in rivista (Articolo in rivista)
- Parole Chiave: Amines; Heterogeneous catalysis; Ionic liquids; Materials science; Polymers; Physical and Theoretical Chemistry; Organic Chemistry
- OA Link: http://hdl.handle.net/10447/286667
Cross-linked polyamine-based materials were easily prepared by reduction of the corresponding cross-linked imidazolium-based materials with sodium borohydride in hot ethanol. Overall, the synthetic procedure is based on the polymerization of a suitable bis-vinylimidazolium salt with or without a suitable support, such as silica or silica-coated magnetic nanoparticles (Î³-Fe2O3@SiO2), followed by reduction. This simple approach allows the synthesis of materials based on a network of secondary and tertiary amines. Materials were characterized by13C cross-polarization magic angle spinning NMR (13C CPMAS NMR), proton spin-lattice relaxation times in the rotating frame (T1ÏH) and thermogravimetric analysis (TGA). Cross-linked polyamine-based materials were used as recoverable catalyst for Knoevenagel reaction. High yields of the condensation products were obtained and up to 11 cycles were carried out.