Shirley P. Onkani1, Paul N. Diagboya1, Fanyana M. Mtunzi1, Michael J. Klink1, Bamidele I. Olu-Owolabi2, Vusumzi Pakade1
1Department of Chemistry, Vaal University of Technology, Vanderbijlpark, South Africa
2Department of Chemistry, University of Ibadan, Nigeria