1. Department of Chemistry, University of Crete, Voutes 71003, Heraklion, Greece
2. Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, Wrocław 50-383, Poland
3. Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
4. Department of Chemistry, University of Patras, 26504 Patras, Greece