1. Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus