1. Department of Chemistry; Chemical Theory Center and Supercomputing Institute; University of Minnesota; 207 Pleasant Street SE 55455-0431 Minneapolis Minnesota USA
2. Institute of Molecular Science and Technologies (ISTM)-; CNR; via Elce di Sotto 8 06123 Perugia Italy
3. Consortium for Computational Molecular and Materials Sciences (CMS); via Elce di Sotto 8 06123 Perugia Italy
4. Department of Chemistry; Biology and Biotechnology; University of Perugia; via Elce di Sotto 8 06123 Perugia Italy
5. Department of Chemistry; KU Leuven; Celestijnenlaan 200F B-3001 Heverlee Belgium