1. Department of Chemistry, University Alioune Diop, Bambey, Senegal
2. Department of Chemistry, University Cheikh Anta Diop, Dakar, Senegal
3. Faculty of Sciences and Technologies, Sultan Moulay Slimane University, Beni-Mellal, Morocco
4. Laboratoire de Tectonique Moléculaire du Solide, Université de Strasbourg, Strasbourg, France