Synthesis, Immobilization, MAS and HR‐MAS NMR of a New Chelate Phosphine Linker System, and Catalysis by Rhodium Adducts Thereof Academic Article uri icon

abstract

  • A new class of tridentate phosphine ligands with the general formula [MeP{(CH2)xPPh2}3]+I - (x=4, 7, 11) and [MeP(CH2PPh2) 3]+OTf-, has been synthesized and fully characterized. The linkers have been immobilized on silica with their phosphonium moieties via electrostatic interactions, and their mobility and leaching has been studied by solid-state HR-MAS (high-resolution magic angle spinning) NMR in various solvents. Immobilized Wilkinson-type rhodium complexes have been obtained by ligand exchange with the surface-bound linkers. The activities and lifetimes of the catalysts have been tested with respect to the hydrogenation of 1-dodecene. The rhodium catalyst precursor bound by the immobilized linker [MeP{(CH2)7PPh2} 3]+I- led to material with the highest activity and lifetime, and it could be recycled for 30atimes in a batchwise manner. The other catalysts show shorter lifetimes. For all catalysts the formation of rhodium nanoparticles with a narrow size distribution around 4anm has been proven. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

altmetric score

  • 3

author list (cited authors)

  • Guenther, J., Reibenspies, J., & Blümel, J.

citation count

  • 30

publication date

  • February 2011

publisher