Platinum(II)-Crosslinked Single-Chain Nanoparticles: An Approach towards Recyclable Homogeneous Catalysts

Platinum(II)-Crosslinked Single-Chain Nanoparticles: An Approach towards Recyclable Homogeneous Catalysts

 

 Knoefl, N. D.; Rothfuss, H.; Willenbacher, J.; Barner-Kowollik, C.; Roesky, P. W. 

Karlsruhe Institute for Technology; UC Santa Barbara

 

Angew. Chem. ASAP

http://onlinelibrary.wiley.com/doi/10.1002/anie.201700718/epdf

Abstract: 

 

 We introduce the synthesis and in-depth characterization of platinum(II)-crosslinked single-chain nanoparticles (PtII-SCNPs) to demonstrate their application as a recyclable homogeneous catalyst. Specifically, a linear precursor copolymer of styrene and 4-(diphenylphosphino)styrene was synthesized via nitroxide-mediated polymerization. The triarylphosphine ligand moieties along the backbone allowed for the intramolecular crosslinking of single chains via the addition of [Pt(1,5-cyclooctadiene)Cl2] in dilute solution. The successful formation of well-defined PtII-SCNPs was evidenced by size exclusion chromatography, dynamic light scattering, nuclear magnetic resonance (1H,31P{1H},195Pt), and diffusion-ordered spectroscopy. Finally, the activity of the PtII-SCNPs as homogeneous, yet recyclable catalyst was successfully demonstrated using the example of the amination of allyl alcohol.