Hydrosilylation of alkenes is an industrially relevant reaction that typically relies on expensive platinum catalysts for increased selectivity and high activity. There is significant interest and current progress in developing heterogenous catalysts that can maintain high performance, but allow for efficient catalyst recycling. We have developed a metal-ligand coordination strategy for heterogeneous single-site Pt catalysts (SSCs) for hydrosilylation, which offer improved surface area, greater control of metal active sites, and recoverability versus traditional heterogeneous catalysts. We have synthesized dipyridyl tetrazine and several asymmetric 2,9-di-substituted phenanthroline-5,6-dione ligands, which each contain carboxylic acid groups that are designed to improve adhesion to the oxide support and thereby promote catalyst stability and recyclability. These ligands are each complexed with Pt(II) salts to generate SSCs. Variation of the functional groups on the ligands also offers an opportunity to study the impact of ligand variation on the catalytic function of the metal active sites. The hydrosilylation of 1-octene with HSi(OMe)<sub>2</sub>Me will be explored with several SSCs and activity, selectivity, and recyclability will be evaluated. With this work, we aim to advance design and tuning of supported metal-ligand single-sites in heterogeneous catalysis.

Ligand functionalization with carboxylic acid groups to improve the recyclability of ceria-supported platinum(II) complexes for hydrosilylation catalysis

ACS Spring Meeting 2021

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