1. Institute for Analytical Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
2. REQUIMTE/LAQV, Chemistry Department, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
3. Centro de Quimica, Chemistry Department, University of Coimbra, 3004-535 Coimbra, Portugal