1. Inorganic Chemistry Laboratory, Chemistry Department, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou 157 71, Greece
2. Sol–Gel Lab, Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, Aghia Paraskevi Attikis 153 41, Greece
3. University of Bialystok, Faculty of Chemistry, Ciolkowskiego 1K, Bialystok 15-245, Poland