1. Centre for Chemical and Biochemical Research (CCBR), Redeemer’s University, Ede, P.M.B. 230, Ede, Osun State 232102, Nigeria
2. Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, Jena D-07743, Germany
3. Chemistry Department, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa
4. Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
5. School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg 3201, South Africa