1. Institute
of Chemistry, University of Campinas (UNICAMP), Campinas, São Paulo 13084-970, Brazil
2. Leopoldo
Américo Miguez de Mello Research and Development Center (CENPES), Petrobras, Rio
de Janeiro, Rio de Janeiro 21941-915, Brazil
3. Brazilian Synchrotron Light Laboratory (LNLS), Campinas, São Paulo 13083-100, Brazil