1. Department of Chemistry, University of Tromsø, N-9037 Tromsø, Norway
2. Department of Chemistry, University of Connecticut, 55 N. Eagleville Rd, Storrs, Connecticut 06269, United States
3. Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein 9300, Republic of South Africa
4. ICMUB, UMR CNRS 6302, Université Bourgogne Franche-Comte, BP 47870, Dijon Cedex 21078, France