Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Single Turnover at Molecular Polymerization Catalysts Reveals Spatiotemporally Resolved Reactions

Single Turnover at Molecular Polymerization Catalysts Reveals Spatiotemporally Resolved Reactions
Quinn T. Easter, Suzanne A. Blum
Multiple active individual molecular ruthenium catalysts have been pinpointed within growing polynorbornene, thereby revealing information on the reaction dynamics and location that is unavailable through traditional ensemble experiments. This is the first single-turnover imaging of a molecular catalyst by fluorescence microscopy and allows detection of individual monomer reactions at an industrially important molecular ruthenium ring-opening metathesis polymerization (ROMP) catalyst under synthetically relevant conditions (e.g. unmodified industrial catalyst, ambient pressure, condensed phase, ca. 0.03 m monomer). These results further establish the key fundamentals of this imaging technique for characterizing the reactivity and location of active molecular catalysts even when they are the minor components. Singled out: Single-turnover detection has enabled the spatiotemporal resolution of individual reactions within growing polymers. The addition of a spectator fluorophore to the polymerization of norbornene enabled individual monomer reactions at an industrially important molecular ruthenium ring-opening metathesis polymerization catalyst to be observed as a bright-green point flash by fluorescence microscopy.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708284

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