1. Institute of Chemistry University of Campinas—UNICAMP, P.O. Box 6154, Campinas, São Paulo 13083-970, Brazil
2. Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium
3. Universidade Estadual de Maringá, Maringá, Brazil
4. Institute of Physics Gleb Wataghin, University of Campinas—UNICAMP, Rua Sérgio Buarque de Holanda 777, Campinas, São Paulo 13083-859, Brazil