1. Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, Cambridgeshire CB2 1EW, U.K., Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K., and CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, U.K.