1. Department
of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
2. Centro
de Química Estrutural, Departamento de Engenharia Química,
Instituto Superior Técnico, University of Lisbon, 1049-001 Lisboa, Portugal
3. CIQA,
FCT, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal