title: Synthesis, solid-state NMR characterization, and application for hydrogenation reactions of a novel Wilkinson's-type immobilized catalyst.
abstract: Silica nanoparticles (SiNPs) were chosen as a solid support material for the immobilization of a new Wilkinson's-type catalyst. In a first step, polymer molecules (poly(triphenylphosphine)ethylene (PTPPE); 4-diphenylphosphine styrene as monomer) were grafted onto the silica nanoparticles by surface-initiated photoinferter-mediated polymerization (SI-PIMP). The catalyst was then created by binding rhodium (Rh) to the polymer side chains, with RhCl3⋅x H2O as a precursor. The triphenylphosphine units and rhodium as Rh(I) provide an environment to form Wilkinson's catalyst-like structures. Employing multinuclear ((31)P, (29)Si, and (13)C) solid-state NMR spectroscopy (SSNMR), the structure of the catalyst bound to the polymer and the intermediates of the grafting reaction have been characterized. Finally, first applications of this catalyst in hydrogenation reactions employing para-enriched hydrogen gas (PHIP experiments) and an assessment of its leaching properties are presented.
authors: Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich Weiss Str. 8, 64287 Darmstadt (Germany).
authors: Safaa
authors: S
authors: Abdulhussain
authors: Hergen
authors: H
authors: Breitzke
authors: Tomasz
authors: T
authors: Ratajczyk
authors: Anna
authors: A
authors: Grünberg
authors: Mohamad
authors: M
authors: Srour
authors: Danjela
authors: D
authors: Arnaut
authors: Heiko
authors: H
authors: Weidler
authors: Ulrike
authors: U
authors: Kunz
authors: Hans Joachim
authors: HJ
authors: Kleebe
authors: Ute
authors: U
authors: Bommerich
authors: Johannes
authors: J
authors: Bernarding
authors: Torsten
authors: T
authors: Gutmann
authors: Gerd
authors: G
authors: Buntkowsky
mesh_terms: D002384:Catalysis; D005030:Ethylenes / Q000737:chemistry; D006865:Hydrogenation; D009682:Magnetic Resonance Spectroscopy; D009943:Organophosphorus Compounds / Q000737:chemistry; D012238:Rhodium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D020058:Styrene / Q000737:chemistry
chemical_list: D005030:Ethylenes; D009943:Organophosphorus Compounds; C061896:triphenylphosphine; D020058:Styrene; D012822:Silicon Dioxide; C036216:ethylene; D012238:Rhodium
keywords: heterogeneous catalysis; para-hydrogen-induced polarization; polymer support; rhodium; solid-state NMR