1. Theoretical and Computational Chemistry Unit, Adekunle Ajasin University, Akungba-Akoko, Nigeria
2. School of Chemistry and Physics, University of Kwazulu-Natal, Durban, South Africa
3. Department of Biochemistry and Molecular Biology, Usmanu Danfodiyo University, Sokoto Nigeria;
4. Department of Chemistry, University of Ibadan, Ibadan, Nigeria