1. CCMAR
and Department of Chemistry and Pharmacy, F.C.T., University of Algarve, P-8005-039 Faro, Portugal
2. Department
of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal
3. CEMDRX,
Department of Physics, University of Coimbra, P-3004-516 Coimbra, Portugal