Nickel and Palladium Complexes of Pyridine-Phosphine Ligands Bearing Aromatic Substituents and Their Behavior as Catalysts in Ethene Oligomerization
作者:Jitte Flapper、Piet W. N. M. van Leeuwen、Cornelis J. Elsevier、Paul C. J. Kamer
DOI:10.1021/om9000378
日期:2009.6.8
chloride complexes coordinated in a square-planar fashion. Instead, binuclear species in which two ligands span two metal centers were observed for 6a−d, and an undefined mixture of complexes was obtained for 6e. In contrast to these neutral palladiumcomplexes, the cationic methylpalladium complexes 7, lacking the chloride anion, appear as well-defined, monomeric complexes. When the nickelcomplexes 5a−d
<i>cis</i>
,
<i>trans</i>
– or Both: Steric Bulk Determines Coordination Mode of Dimeric Palladium Complexes with Bridging Pyridine‐Phosphane Ligands
作者:Jitte Flapper、Philip Wormald、Martin Lutz、Anthony L. Spek、Piet W. N. M. van Leeuwen、Cornelis J. Elsevier、Paul C. J. Kamer
DOI:10.1002/ejic.200800804
日期:2008.11
ligands are insoluble and have been characterized by various techniques, including solid-state NMR and (for 6a, b, and d) single-crystal X-ray diffraction, showing that bimetallic complexes are formed in which two ligands span two palladium centers. The configuration around these centers is determined by the stericbulk of the ligand. In complexes 6c,d, with the ligands bearing the largest steric groups