Triphenylphosphine-Functionalized Core-Cross-Linked Micelles and Nanogels with a Polycationic Outer Shell: Synthesis...

Area of Science:

• Polymer Chemistry and Materials Science
• Catalysis and Green Chemistry
• Nanotechnology

Background:

• Developing efficient and recyclable catalytic systems is crucial for sustainable chemical synthesis.
• Polymeric nanoreactors offer a platform for encapsulating and stabilizing catalytic species.
• Achieving low metal leaching and high recyclability in homogeneous catalysis remains a challenge.

Purpose of the Study:

• To synthesize unimolecular amphiphilic nanoreactors with a polycationic shell for catalytic applications.
• To incorporate triphenylphosphine (TPP) ligand functionality into the nanoreactors for rhodium complexation.
• To evaluate the performance of these nanoreactors in rhodium-catalyzed aqueous biphasic hydrogenation reactions.

Main Methods:

• Synthesis of core-cross-linked micelles (CCM) and nanogels (NG) via RAFT polymerization.
• Incorporation of triphenylphosphine (TPP) ligand functionality using 4-diphenylphosphinostyrene (DPPS) comonomer.
• Loading with [RhCl(COD)]2 and application as nanoreactors in aqueous biphasic hydrogenation of styrene and 1-octene.

Main Results:

• Successfully synthesized P4VPMe+ I- based nanoreactors (CCM and NG) with narrow size distributions.
• Achieved high catalytic activity (TOF up to 300 h-1) in hydrogenation reactions at mild conditions.
• Demonstrated excellent catalyst recyclability over 10 cycles with negligible rhodium loss (<0.1 ppm).

Conclusions:

• Unimolecular amphiphilic nanoreactors provide an effective platform for recyclable homogeneous catalysis.
• The developed nanoreactors exhibit superior performance in terms of activity, stability, and metal retention.
• This approach offers a promising strategy for developing greener and more economical catalytic processes.