Metal-Metal d-d Interaction through the Discrete Stacking of Mononuclear M(II) Complexes (M = Pt, Pd, and Cu) within an Organic-Pillared Coordination Cage.

The article reports that stacking of planar transition-metal complexes via d-d interaction between the metal centers promises unique optical, electroconductive, and magnetic properties. Here, the authors report that simple and rather classical metal complexes, which have been never shown to form an intermolecular metal-metal bond, exhibit characteristic metal-metal interaction through accommodation within a coordination cage. It should be noted that the estimated Copper(II)-Copper(II) distance, as demonstrated in the article, is longer than the Platinum(II)-Platinum(II) distance determined by X-ray analysis.