Stanley, George G. - Louisiana State University

个人简介

Bachelor's Degree(s): University of Rochester, 1975 PhD: Texas A&M University, 1979 PostDoc: Universite Louis Pasteur, Stransbourg, France, 1979

研究领域

We have designed and synthesized a new class of binucleating polydentate phosphine ligands for preparing novel bimetallic transition metal complexes. Considerable interest has been shown in showing that multiple metal centers can exhibit cooperative behavior in catalytic reactions and show superior activities and selectivities relative to monometallic complexes. This goal has been dramatically achieved through the design and synthesis of a new binucleating tetraphosphine ligand that can bridge and chelate two metal centers. This ligand, called et,ph-P4, exists in the two diastereomeric forms shown to the left. [Rh2(nbd)2(et,ph-P4)]2+ (nbd = norbornadiene) is a precursor for a remarkable bimetallic hydroformylation catalyst. Hydroformylation is the largest homogeneous industrial catalytic process for converting alkenes, H2 and CO, into aldehyde products. Our bimetallic catalyst has higher activity and selectivity for linear aldehyde products compared to current commercial Rh/PPh3 catalysts. The activity and selectivity of our bimetallic catalyst is extremely unusual because electron-rich chelating phosphines like et,ph-P4 are well known to generally deactivate rhodium toward hydroformylation and lower the selectivity to linear aldehyde. We have demonstrated (Science, 1993) that this catalyst represents one of the most dramatic examples of bimetallic cooperativity in homogeneous catalysis.

近期论文

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Fronczek, Frank R.; Delord, Terry J.; Watkins, Steven F.; Gueorguieva, Petia; Stanley, George G.; Zizza, Annegret S.; Cornelius, Jeffrey B.; Mantz, Yves A.; Musselman, Ronald L.. A Solid-State Spectral Effect in Eclipsed Tetracyanonickelates: X-ray Crystal Structure, Polarized Specular Reflectance Spectroscopy, and ZINDO Modeling of Sr[Ni(CN)4].5H2O, Rb2[Ni(CN)4].H2O, and Na2[Ni(CN)4].3H2O. Inorganic Chemistry, 2003, 42(22), 7026-7036 D. Aubry, F.R. Fronczek and G.G. Stanley. Separating the Racemic and Meso Diastereomers of a Binucleating Tetraphosphine Ligand System. Inorg. Chem., 2001, 40, 5036-5041 F.R. Fronczek, D.A. Aubry and G.G Stanley. Refinement of Lithium Tetrahydroxoborate with Low-temperature CCD Data. Acta Cryst., 2001, C. Hunt, Jr., F.R. Fronczek, D.R. Billodeaux and G.G. Stanley. A Monometallic Rh(III) Tetraphosphine Complex: Reductive Activation of CH2CL2 and Selective meso to racemic Tetraphosphine Ligand Isomerization. Inorg. Chem., 2001, 40, 5192-5198