1. Theoretical Chemistry Group, Institute of Physical and Theoretical Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
2. The Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, Athens 116 35, Greece
3. Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, SP, Brazil