1. Department of Chemical Sciences, University of Catania, Vle A. Doria 6, 95125 Catania, Italy, Institute of Chemistry, University of Debrecen, H-4010 Debrecen, Hungary, Institute of Biomolecular Chemistry, CNR, Traversa La Crucca 3, 07040 Baldinca-Li Punti (Sassari), Italy, Department of Chemistry, University of Sassari, Via Vienna 2, 07100 Sassari, Italy, and Institute of Biostructures and Bioimaging, CNR, Vle A. Doria 6, 95125 Catania, Italy