advances in pnp-ligated rare-earth-metal complexes: reactivity and catalytic performances

Due to the large ionic radius and high electro-positivity nature, rare earth metal complexes are difficult to stabilize and undergo pathways like ligand redistribution and intramolecular c-h activation. to solve such problems and retain reactive versatility, rare earth complexes supported by a variety of tridentate pnp pincer ligands have been explored. such complexes can serve as perfect precursors for preparing ultra-active rare earth species containing two metal-carbon bands, let alone ln=n and ln=p multiple bonds. in addition, the combined stability and activity of the cation rare earth mediates made them the best catalysts for the polymerization of olefins and other non-polar hydrocarbon monomers, especially conjugated dienes. the practical utilization of rare earth metal catalysts for new materials production have also extensively explored by experts from the academic and industries.