1. Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
2. Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
3. Laboratoire de Chimie Physique, UMR8000 CNRS-Universite de Paris XI, Campus d'orsay, Batiment 350, 91405 Orsay Cedex, France