Phosphine-stabilized ruthenium nanoparticles: The effect of the nature of the ligand in catalysis

Various ligands not forming monometallic complexes were used for Ru nanoparticle stabilization, enabling the control of size, shape, and electronic properties. HRMAS NMR spectroscopy allowed us to study surfacebound molecules, evidencing ligand hydrogenation and decomposition of THFduring the RuNP synthesis. Catalysis studies underscore the importance of the nature of the ligands. The RuNPs were tested in the hydrogenation of aromatics, showing very high activities (TOF ≥ 60 000 h -1, 40 bar, 393 K). A pronounced ligand effect was found, and dialkylaryl phosphine ligands gave the fastest catalyst. © 2012 American Chemical Society.