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Christopher R. Clough coauthored research on triphenylphosphine.^[ref]

Triphenylphosphine is $\mathrm{PP}{\mathrm{h}}_3$, a neutral phosphine ligand whose phenyl substituents affect both steric demand and electronic donation.

Author manuscript: web.mit.edu/pmueller/www/own_papers/clough_etal_2012.pdf

Christopher R. Clough, Jared S. Silvia, Peter Müller and Christopher C. Cummins, Inorganica Chimica Acta 382 (2012), 195–198. Reports crystallographic characterization of the facial O-bound tricarbonyl anion. The isolated counterion in that work is PPN, so its yield and solubility should not be transferred to a sodium-salt preparation.