1. Chemistry Institute, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
2. Universidade Federal do Rio Grande do Sul, Faculdade de Farmácia, Porto Alegre, Brazil
3. Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA
4. CENIMAT/i3N, Department of Materials Science, NOVA School of Science and Technology (FCT-NOVA), NOVA University Lisbon, Campus de Caparica, Caparica, Portugal