1. Department of Chemistry, Faculty of Sciences, University of Maroua, P.O. Box 55, Cameroon
2. Department of Theoretical Chemistry, University of Duisburg-Essen, Universitätsstr. 2, D-45141 Essen, Germany
3. Department of Mechanical Engineering, College of Engineering and Technology, University of Sargodha, Sargodha 40100, Pakistan
4. Groupe de Simulations Numériques en Magnétisme et Catalyse, Faculté des Sciences et Techniques, Université Marien Ngouabi, Brazzaville B.P. 69, Congo
5. National Advanced School of Engineering, University of Maroua, P.O. Box. 46, Maroua, Cameroon
6. Institute fur Anorganische Chemie Christian-Albrechts-Universität zu Kiel, Max-Eyth-Strasse 2, 24118 Kiel, Germany
7. The Abdus Salam International Centre for Theoretical Physics (ICTP), Strada Costiera 11, 34151 Trieste, Italy
8. Higher Institute of Agriculture, Wood, Water and Environment, University of Ebolowa, P.O. Box 746, Ebolowa, Cameroon