Supramolecular association of M²⁺?p induced by different electrostatic properties using naphthyl substituted ß-diketonate complexes (metal = Cu, Pd, Pt)

Expanded p-conjugated coordination complexes, [M(L²)₂] (M = Cu²⁺, Pd²⁺, and Pt²⁺; L²= dinaphthoylmethanido^-), were prepared and the different metal characteristics were found due to the supramolecular associations: [Cu(L²)₂] shows a remarkable M²⁺?p interaction (3.249 Å) inducing the cationicity of Cu²⁺and the strength of the interactions clearly decreases for the Pd²⁺and Pt²⁺ions (3.785 and 4.610 Å), indicating their electron-rich and nucleophilic characteristics.