1. Instituto de Química – UFRGS, 91501-970, Porto Alegre, RS, Brazil
2. School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
3. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
4. Unitat de Tecnologíe Químiques, EURECAT, Tarragona, 43007 Spain
5. Department of Chemistry, University of Victoria, P. O. Box 3065, V8W 3V6, BC, Canada