1. Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
2. CIQUP, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal
3. Department of Chemistry & QOPNA, University of Aveiro, Aveiro 3810-193, Portugal