1. Laboratory of Analytical and Molecular Chemistry, Polydisciplinary Faculty of Safi; Cadi Ayyad University; Marrakech, Safi Route SidiBouzid BP 4162 46000 Morocco
2. Department of Chemistry; University of Uyo; P. M. B. 1017 Uyo Nigeria
3. Condensed Matter and Nanosciences; Université Catholique de Louvain; Place Louis Pasteur 1 bte L4.01.02 Louvain-la-Neuve 1348 Belgium