1. Department of Chemistry, University of Patras, 265 04 Patras, Greece
2. Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA
3. Institute of Materials Science, National Centre of Scientific Research “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece
4. Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus