1. Theoretical Chemistry Laboratory, Unit of Theoretical and Structural Physical Chemistry, Namur Institute of Structured Matter, University of Namur, B-5000 Namur, Belgium
2. Univ Angers, CNRS, MOLTECH—Anjou, F-49000 Angers, France
3. Institut des Sciences Moléculaires (ISM, UMR CNRS 5255), Université de Bordeaux, 351 Cours de la Libération, 33405 Talence, France