Pyridylphosphines have variable binding modes, with distinct electronic properties and coordination geometries, allowing them to be used in a wide variety of applications. Trispyridylphosphines (PPy3R) are particularly interesting as the position of the nitrogen donors relative to the phosphorus allows for facial binding as well as coordination to the phosphorous donor. While there are examples in the literature of transition metal complexes of trispyridylphosphines, in the literature few examples examine the effect(s) of pyridyl ring substitution effects the donor/acceptor properties of the ligand. The electronic effects at both the nitrogen and phosphorus donors were examined using associated molybdenum carbonyl complexes. Both (P)Py3R P-Mo(CO)5 and (N,N,N)PPy3R-Mo(CO)3 complexes were prepared using infrared and 31P NMR spectroscopies, and x-ray crystallography. Synthetic, structural and spectroscopic details are presented.

Probing steric and electronic effects in substituted trispyridylphosphine ligands using molybdenum carbonyl complexes

256th National Meeting (2018)

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