Canvassing New Ligand Space: A Tale of Boron-based Allyl Equivalents and a Marriage between PPh3 and BPh4-
Ligand design is imperative to the formulation of new catalysts, molecules that serve to accelerate chemical reactions, without themselves being consumed – a cornerstone of the green chemistry movement. As part of our group’s ongoing efforts into the catalytic reduction of robust small-molecules (e.g., N2, CO, CO2 etc.) for access to high-value chemical feedstocks, we have stressed judicious ligand choice as key to achieving selective and sustainable reactivity.
This presentation will focus on the design, synthesis, characterization, and ensuing coordination chemistry of two new ligand scaffolds (with an eye toward application in small-molecule activation). First, the reactivity of a diphosphinoborane with nickel and platinum precursors will be highlighted, generating eta(3)-P,B,P complexes - the first examples of P,B,P-based allyl analogues. Secondly, the 9-phosphatriptycene-10-borate anion will be introduced. A fusion of two ubiquitous organometallic reagents, triphenylphosphine and tetraphenylborate, the synthesis, characterization, and coordination behavior of this species with iron and cobalt will be provided.