1. Institute of Chemistry Universidade Federal do Rio Grande do Sul Porto Alegre 91501970 RS Brazil
2. Department of Chemistry University of York York United Kingdom
3. School of Physics and Astronomy University of Leeds Leeds LS2 9JT United Kingdom
4. Department of Physics Universidade Federal de Santa Catarina Florianópolis SC Brazil
5. Faculty of Pharmacy Universidade Federal do Rio Grande do Sul Porto Alegre RS Brazil