1. Department of Chemistry, UiT – The Arctic University of Norway, N-9037 Tromsø, Norway
2. Centro de Química, Instituto de Ciencias, Universidad Autónoma de Puebla, Edif. IC9, CU, San Manuel, 72570 Puebla, Puebla, Mexico
3. Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa