1. Department of Chemistry, Universidade Federal do Paraná, Curitiba, Paraná 81531‐980, Brazil, http://www.quimica.ufpr.br/site/
2. Department of Chemistry, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040‐900, Brazil
3. Department of Inorganic Chemistry, Chemistry Institute Universidade de São Paulo, São Paulo, São Paulo 05508‐000, Brazil