Square planar platinum(II) complexes are rather well known compounds in chemotherapeutic cancer treatments. But they show also very interesting electro- and photoluminescence properties. Research in organic light emitting diodes (OLED) being trendy, the interest of the scientists for such complexes has grown in these recent years.  Recently Mauro, De Cola and co-workers reported a new family of square planar Pt(II) complexes [2-4] containing a tridentate N-donor ligand, the 2,6-bis(3-(trifluoromethyl)-1H1,2,4-triazol-5-yl)pyridine (pyC5-CF3-tzH2). The coordination sphere is completed by various monodentate ligands. These coordination compounds showed remarkable supramolecular assembling properties and high photoluminescence quantum yields due to non-covalent intermolecular (metalmetal and π–π) interactions.