1. a Section of Inorganic and Analytical Chemistry, Department of Chemistry , University of Ioannina , 45110 Ioannina, Greece
2. f Section of Inorganic Chemistry, Department of Chemistry , Namık Kemal University , 59030, Tekirdag, Turkey
3. b Medical Physics Laboratory , Medical School, University of Ioannina , 45110 Ioannina, Greece
4. c Department of Chemistry , University of Cyprus , 1678 Nicosia, Cyprus
5. d Department of Chemistry , McGill University , 801 Sherbrooke, Montreal, Quebec H2A 2K6, Canada
6. e Rega Institute for Medical Research, Katholieke Universiteit Leuven , Minderbroedersstraat 10, B-3000 Leuven, Belgium