In the title compound, [Cu(C20H24N2)(2)]BF4, the complex cation adopts a di
storted tetrahedral structure, the dihedral angle between the least-squares
planes of the chelating ligand backbones being 51.1 (2)degrees. This flatt
ening of the tetrahedral coordination sphere may be driven by the presence
of intramolecular pi-pi stacking interactions between mesityl groups on adj
acent ligands.