1. Dipartimento
di Scienze Chimiche e Geologiche, Università di Modena e Reggio-Emilia, 183 via G. Campi, I-41125 Modena, Modena, Italy
2. Institut
de Recherche de Chimie Paris CNRS, Chimie ParisTech, 11 rue P.
et M. Curie, F-75005 Paris 05, France
3. Gaussian, Inc., 340 Quinnipiac
Street, Building 40, Wallingford, Connecticut 06492, United States
4. Chemistry
and Chemical Biology, University of California, Merced, California 95343, United States
5. Institut Universitaire de France, 103 Boulevard Saint Michel, F-75005 Paris, France