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Brian Johnson


The bridging ligand, 2-[bis(diphenylphosphino)methyl]pyridine (PNP), is ideal for synthesizing mono- and bi-metallic catalysts due to its potential to be bidentate (P-P or P-N) or tridentate and its ability to bind to one or more metals. Three Pd-PNP complexes, [Pd(PNP)2]+2 (1) and two complexes resulting from the removal of one or two methine pronouns (2 and 3), have been synthesized. The removal of one methine proton changes the PNP bidentate binding mode. In complex 1 and 3, the two PNP ligands are P-P bound. However, upon the removal of one methine proton, one of the PNP ligands in 2 changes to P-N binding. This change in coordination of the PNP ligand upon the removal of one or two methine protons may provide control over the ability to add a second metal in future research. All complexes were characterized with FT-IR, 31P{1H} NMR, 1H NMR and x-ray crystallography.

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