1. Inorganic Materials Research Laboratory, Department of Pure and Applied Chemistry, University of Calabar, 540242 Calabar, Nigeria
2. Department of Pure and Applied Chemistry, University of Calabar, 540242 Calabar, Nigeria
3. Computational and Bio-Simulation Research Group, University of Calabar, 540242 Calabar, Nigeria
4. School of Chemistry, Nottingham University, NG7 2RD Nottingham, U.K.
5. Department of Chemistry, Federal University of Lafia, 950101 Lafia, Nigeria