1. Departamento de Química; Universidade Federal de Lavras; 37200-900 Lavras - MG Brazil
2. Theoretical Chemistry; Department of Chemistry and Pharmaceutical Sciences; AIMMS, Vrije Universiteit Amsterdam; De Boelelaan 1083 1081 HV Amsterdam The Netherlands
3. Chemistry Institute; University of Campinas; 13083- 970 Campinas - SP Brazil
4. Leiden Institute of Chemistry; Gorlaeus Laboratories; Leiden University; Einsteinweg 55 2333 CC Leiden The Netherlands