1. Institute
of Chemistry of São Carlos, University of São Paulo, CP 780, CEP 13560-970, São Carlos, São Paulo, Brazil
2. Department
of Chemistry, Federal University of São Carlos, CP 676, CEP 13565-905, São Carlos, São Paulo, Brazil
3. Department
of Chemistry, Saint Louis University, 3501 Laclede Avenue, St. Louis, Missouri 63103, United States