1. Institute of Exact and Technological Sciences, Department of Applied Mathematics, Federal University of Triângulo Mineiro, Uberaba 38064-200, Minas Gerais, Brazil
2. Institute of Chemistry, University of Brasília, Brasília 79910-900, Distrito Federal, Brazil
3. Institute of Chemistry, Department of Physical Chemistry, State University of Campinas, Campinas 13083-970, São Paulo, Brazil