Synthesis,Solid‐State NMR Characterization,and Application for Hydrogenation Reactions of a Novel Wilkinson’s‐Type Immobilized Catalyst |
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Authors: | Safaa Abdulhussain Dr Hergen Breitzke Dr Tomasz Ratajczyk Dr Anna Grünberg Mohamad Srour Danjela Arnaut Heiko Weidler Ulrike Kunz Prof?Dr Hans Joachim Kleebe Dr Ute Bommerich Prof?Dr Johannes Bernarding Dr Torsten Gutmann Prof?Dr Gerd Buntkowsky |
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Institution: | 1. Eduard‐Zintl‐Institut für Anorganische und Physikalische Chemie, Technische Universit?t Darmstadt, Alarich Weiss Str. 8, 64287 Darmstadt (Germany);2. Polish Academy of Sciences, Institute of Physical Chemistry, 44/52 Kasprzaka, 01‐224 Warsaw (Poland);3. Fachbereich Material‐ und Geowissenschaften, Technische Universit?t Darmstadt, Petersenstrasse 23, 64287 Darmstadt (Germany);4. Leibniz Institute for Neurobiology, Brenneckestrasse 6, 39118 Magdeburg (Germany);5. Institute for Biometry and Medical Computer Science, Otto‐von Guericke University Magdeburg, Leipziger Strasse 44, 39120 Magdeburg (Germany) |
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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 RhI provide an environment to form Wilkinson’s catalyst‐like structures. Employing multinuclear (31P, 29Si, and 13C) 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. |
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Keywords: | heterogeneous catalysis para‐hydrogen‐induced polarization polymer support rhodium solid‐state NMR |
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