1. School of Chemistry and Physics, University of Kwazulu-Natal and National Institute of Theoretical and Computational Sciences (NITheCS), 3209 Pietermaritzburg, South Africa
2. Department of Chemistry, The University of Akron, Akron, Ohio 44325-3601, United States
3. School of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-3909, United States
4. Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali, Università degli Studi di Messina, 98125 Messina, Italy
5. CNR IPCF, 37-98158 Messina, Italy