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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
Published on: November 29, 2018
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Activating Ru nanoparticles on oxide supports for ring-opening metathesis polymerization.
Alex J Mantanona1, Katelyn Wood, Yann Schrodi
1California State University Northridge, Department of Chemistry and Biochemistry, 18111 Nordhoff Street, Northridge, CA 91330, USA. simon.garrett@csun.edu.
Dalton Transactions (Cambridge, England : 2003)
|May 30, 2018
Summary
This study details the synthesis of ruthenium (Ru) nanoparticles on silica and titania supports. These supported Ru nanoparticles show promise for olefin metathesis reactions, enabling the creation of novel polymer composites.
Area of Science:
- Heterogeneous catalysis
- Nanomaterials science
- Polymer chemistry
Background:
- Supported nanoparticles exhibit altered reactivity compared to homogeneous catalysts.
- Ruthenium (Ru) nanoparticles on oxide supports are promising for olefin metathesis.
- Developing functional heterogeneous Ru catalysts is an active area of research.
Purpose of the Study:
- To report a method for synthesizing Ru nanoparticles supported on silica (SiO2) and titania (TiO2).
- To characterize the synthesized Ru nanoparticles and their catalytic activity.
- To synthesize nanoparticle-embedded polymers using these supported catalysts.
Main Methods:
- Synthesis of Ru nanoparticles on SiO2 and TiO2 supports.
- Characterization using X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM).
- Catalytic testing in ring-opening metathesis via diazo activation and polymer synthesis (norbornene, norbornadiene) using dry box and Schlenk line techniques.
Main Results:
- XPS confirmed the dominance of Ru(0) when not exposed to air.
- TEM revealed Ru nanoparticle sizes of 3.1 ± 0.8 nm (on SiO2) and 5.6 ± 1.3 nm (on TiO2).
- Modest catalytic activity was observed, leading to the synthesis of nanoparticle-embedded polymer composites.
Conclusions:
- A viable method for preparing supported Ru nanoparticles for catalysis was established.
- The synthesized Ru/support/polymer composites were successfully characterized.
- Supported Ru nanoparticles show potential for advanced polymer synthesis and catalysis.
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