Organobimetallic SCNPs of Polycyclooctadiene-co-polynorbornene carboxylate via Orthogonal Complexation of Rhodium(I) and Rhodium(II)

Sudheendran Mavila, Chemistry, Ben-Gurion University of Negev, Beer-Sheva, Israel
N. Gabriel Lemcoff, Chemistry, Ben-Gurion University of Negev, Beer-Sheva, Israel

Single chain nanoparticles (SCNPs) prepared via the intramolecular cross-linking of single polymer chains are suitable for various applications such as nanomedicine, catalysis, imaging, recognition, etc.[1] We have recently developed an intramolecular chain collapse approach to synthesize nanometric size mono- and bimetallic hybrid particles of ROMP-derived poly(COD) using Rhodium(I), Iridium(I) and Nickel(0) complexes as cross-linkers.[2] We report herein the synthesis of novel organobimetallic SCNPs of polycyclooctadiene-co-polynorbornene carboxylate utilizing orthogonal 1,5-diene and carboxylate functionalities. The intramolecular chain collapse was achieved via the exchange of acetate and ethylene ligands of [Rh(OAc)2]2  and [RhCl(C2H4)2]2 respectively with carboxylate and 1,5-diene functional groups of the co-polymer. These well-defined polymeric complexes were characterized by DLS and SEC measurements. Moreover, these SCNPs with high metal load were used as a template for unprecedented synthesis of metallic nanoparticles of defined size and number of atoms. The synthesis, characterization and properties of these novel organometallic nanoparticles will be presented.


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