1. Institute of Chemistry, São Paulo State University-UNESP, R. Prof. Francisco Degni, 55, Araraquara, SP, Brazil
2. São Carlos Institute of Physics, São Paulo University − USP, Av. Trabalhador Sãocarlense 400, São Carlos, SP, Brazil
3. Institut für Physikalische Chemie, Westfälische Wilhelms-Universität, Corrensstraße 28-30, D 48149 Münster, Germany