1. a Faculty of Pharmacy, Inorganic Chemistry Laboratory, University of Medicine and Pharmacy of Craiova , 1 May Avenue, No. 66, 200638, Craiova , Romania
2. b Faculty of Chemistry, Inorganic Chemistry Laboratory, University of Bucharest , Dumbrava Roşie, No. 23, 70254, Bucharest , Romania
3. c Romanian Academy, Physical-Chemistry Institute , Spl. Independenţ ei, No. 202, 77208, Bucharest , Romania