1. Institute of Science and Technology Federal University of the Jequitinhonha and Mucuri Valleys, UFVJM Diamantina 39100-000 Minas Gerais Brazil
2. Institute of Chemistry Federal University of Uberlândia, UFU Patos de Minas 38700-128 Minas Gerais Brazil
3. Department of Natural Sciences Federal University of São João del-Rei, UFSJ São João del-Rei 36307-352 Minas Gerais Brazil