1. Department
of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, U.K.
2. Department
of Chemistry, Universidade Federal de São Carlos (UFSCAR), 13565-905 São Carlos, SP, Brazil
3. Lehrstuhl
für Theoretische Chemie, Ruhr-Universität Bochum, 44801 Bochum, Germany
4. Facultad
de Ciencias Químicas, Universidad Nacional de Córdoba, INFIQC, 5000 Córdoba, Argentina
5. Departamento
de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain