1. Department of Chemistry; College of Science; King Saud University; P.O. Box 2455 11451 Riyadh Kingdom of Saudi Arabia
2. Department of Chemistry; Faculty of Science; Alexandria University; P.O. Box 426 Ibrahimia Alexandria 21321 Egypt
3. Institute for Research in Biomedicine-Barcelona; Baldiri Reixac 10 08028 Barcelona Spain
4. Networking Centre on Bioengineering; Biomaterials and Nanomedicine (CIBER-BBN); Barcelona Science Park, Baldiri Reixac 10 08028 Barcelona Spain
5. Institut fuer Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 D-12489 Berlin
6. School of Chemistry & Physics; University of KwaZulu-Natal; 4001 Durban South Africa
7. Department of Organic Chemistry; University of Barcelona; Marti i Franques 1-11 08028 Barcelona Spain