1. Inorganic Chemistry Laboratory; Department of Chemistry; National and Kapodistrian University of Athens, Panepistimiopolis, Zografou; 15771 Athens Greece
2. National Hellenic Research Foundation; Institute of Biology; Medicinal Chemistry and Biotechnology; Vas. Constantinou 48 11635 Athens Greece
3. NCSR “Demokritos”; Institute of Nanoscience and Nanotechnology; 15310 Aghia Paraskevi Athens Greece
4. School of Chemistry; University of Southampton; University Road Southampton SO17 1BJ United Kingdom
5. Department of Physics; University of Ioannina; 45110 Ioannina Greece
6. Faculty of Chemistry and Mineralogy; Institute of Inorganic Chemistry; Universität Leipzig; Johannisallee 29 D-04103 Leipzig Germany