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

Abstract

Expanded π-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⁺⋯π 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.