Hydrosilation is the most common reaction employed for silicon polymer product synthesis and specifically paper release coatings. Currently, the industrial process requires high heat curing and higher than desired loading of precious metal catalyst. However, there have been recent reports on photoreactive platinum catalysts that allow for UV or even visible light curing. It has been demonstrated that cyclopentadienyl platinum complexes have a higher photochemical activity than the commonly used Pt catalyst, Pt(acac)2. In this study, we use density functional theory (DFT) and nuclear magnetic resonance (NMR) spectroscopy to determine the electronic structure of (CpMe)PtMe3 catalyst. We have determined 195Pt and 1H NMR chemical shifts and two-dimensional 195Pt-1H NMR spectroscopy in conjunction with the charge distribution and NMR chemical shifts calculated by DFT methods to characterize the interesting behavior of the molecular orbitals, specifically the interaction of the metal center with the methyl ligands. The ultimate goal is to understand the electronic structure of the (CpMe)PtMe3 complex in order to design new generation of catalysts with improved catalytic performance.

Development and characterization of a new generation of hydrosilation catalysts for silicon polymers

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