[1] Univ Barcelona, Dept Quim Inorgan, E-08028 Barcelona, Spain
[2] Univ Barcelona, Dept Quim Fis, E-08028 Barcelona, Spain
[3] Univ Barcelona, Ctr Recerca & Quim Teor, E-08028 Barcelona, Spain
[4] Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel
[5] Hebrew Univ Jerusalem, Lise Meitner Minerva Ctr Computat Quantum Chem, IL-91904 Jerusalem, Israel