Rh nanoparticles confined in triphenylphosphine oxide-functionalized core-crosslinked micelles with a polyanionic shell: Synthesis, characterization, and application in aqueous biphasic hydrogenation

Core-crosslinked micelles (CCMs) with a hydrophilic polyanionic shell made of poly(sodium styrene sulfonate) chains, P(SS − Na + ), a triphenylphosphine oxide-functionalized polystyrene core (TPPO@PSt) and crosslinked at the inner end of the polystyrene chains by diethylene glycol dimethacrylate (DEGDMA) were synthesized by reversible addition-fragmentation chain-transfer (RAFT) polymerization as a stable TPPO@CCM-A latex. One-pot synthesis of rhodium nanoparticles (RhNPs) by the reduction of [Rh(COD)( μ -Cl)] 2 in the aqueous TPPO@CCM-A latex yielded a stable RhNP-TPPO@CCM-A latex without the need of additional stabilizer or base. This Rh-loaded latex was applied to the catalytic biphasic hydrogenation of styrene under mild conditions with complete selectivity towards ethylbenzene and corrected turnover frequencies ( c TOFs) ranging from 3250 to 10,010 h −1 based on the surface atoms of the RhNPs. Importantly, the catalytic phase proved recyclable after product extraction, owing to the efficient retention of the RhNPs by the core TPPO ligands. • Core-crosslinked micelles with anionic shell and triphenylphosphine oxide in core. • One-pot synthesis of nanocatalyst with latex having anchored Rh nanoparticles. • Benign and selective catalytic biphasic hydrogenation of styrene with nanocatalyst. • Functional polymer provides efficient retention of Rh and catalyst recyclability.