Enhanced association for C70 over C60 with a metal complex with corannulene derivate ligands

The geometry imposed by the coordination sphere around the metal, together with the choice of the arms can be advantageously used to build corannulene-based molecular tweezers, which show great affinities for C-60 and C-70, as revealed by NMR titration experiments, mass spectroscopy, DFT calculations and the single crystal X-ray structural analysis of the compound C-60 subset of 1.