Hierarchical Assembly toward Nanoparticles of a Chiral Palladium Supramolecular Complex Based on Bicyclo[3.3.1]nonane Framework

The cyclic supramolecular coordination constructs were synthesized via metal-directed self-assembly from cis-protected Pd­(II) precursor and chiral and racemic C2 symmetric V-shaped bicyclo[3.3.1]­nonane-based ligands incorporating pyridyl groups. In the complexes, these ligands act as bridges to connect together metal centers resulting in dinuclear and tetranuclear assemblies capable of further hierarchical aggregation on surfaces as well as in solution. Supramolecular structures obtained were characterized by mass spectrometry and NMR spectroscopy. Chiroptical properties of the ligand and the corresponding complex have also been analyzed. Moreover, the atomic force microscopy and dynamic light scattering experiments revealed a formation of stable nanoparticles from these complexes in the solution and the solid state.