1. Departamento de Química, ITN, Estrada Nacional 10, 2686-953, Sacavém, Portugal, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada, Christopher Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom, Chemistry Department, Loughborough University, Loughborough, Leicestershire, LE11 3TU, United Kingdom, and Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045