1. Department of Chemistry, University of Ioannina, GR-45110 Ioannina, Greece
2. Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. Department of Materials Science and Technology, University of Crete, GR-71003 Heraklion, Greece
4. Institute of Materials Science and Computing, University Research Center of Ioannina, GR-45110, Ioannina, Greece