858012-05-2Relevant academic research and scientific papers
Activation of H2 by a highly distorted RhII complex with a new C3-symmetric tripodal tetraphosphine ligand
Wassenaar, Jeroen,De Bruin, Bas,Siegler, Maxime A.,Spek, Anthony L.,Reek, Joost N. H.,Van Der Vlugt, Jarl Ivar
supporting information; scheme or table, p. 1232 - 1234 (2010/06/16)
Facile oxidation of a sterically encumbered RhI complex generates a stable RhII metalloradical species; the latter is able to activate H2 under formation of the corresponding RhIII complex.
Versatile new C3-symmetric tripodal tetraphosphine ligands; structural flexibility to stabilize Culand Rhl species and tune their reactivity
Wassenaar, Jeroen,Siegler, Maxime A.,Spek, Anthony L.,De Bruin, Bas,Reek, Joost N. H.,Van Vlugt, Jarl Ivar Der
scheme or table, p. 6495 - 6508 (2010/10/04)
The high-yielding synthesis and detailed characterization of two well-defined, linkage isomeric tripodal, tetradentate allphosphorus ligands 1-3 Is described. Coordination to Cul resulted in formation of complexes 4-6, for which the molecular structures indicate overall tridentate coordination to the copper atom in the solid state, with one dangling peripheral phosphine. The solution studies suggest fast exchange between the three phosphine side-arms. For these new Cul complexes, preliminary catalytic activity In the cyclopropanation of styrene with ethyldiazoacetate (EDA) is disclosed. The anticipated well-defined tetradentate coordination in a C 3-symmetric fashion was achieved with Rhl and lr l, leading to the overall five-coordinated complexes 7-12. Complex 11 has the norbornadiene (nbd) ligand coordinated in an unprecedented monodentate 2,3-η2 mode to Rh. Furthermore, unexpected but very interesting redox-chemistry and reactivity was displayed by the Rh(Cl)-complexes 7 and 8. Oxidation resulted In the formation of stable Rhll metalloradicals [7]PF6 and [8]PF6 that were characterized by X-ray crystallography, magnetic susceptibility measurements, cyclic voltammetry, and electron paramagnetic resonance (EPR) spectroscopy. Subsequent redox-reactivity of these metalloradicals toward molecular hydrogen is described, resulting in the formation of Rhlll hydride compounds.
