1. Departament de Química Biològica (IQAC − CSIC), c/Jordi Girona 18, Barcelona E-08034, Spain
2. Laboratoire de Physique et Chimie Théoriques, UMR CNRS 7019, University of Lorraine, CNRS, BP 70239, Vandoeuvre-lès-Nancy 54506, France
3. Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6316, United States