1. School of Chemistry, University of East Anglia, University Plain, Norwich, Norfolk NR4 7TJ, U.K., Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K., School of Physical & Geographical Sciences, Keele University, Staffordshire ST5 5BG, U.K., and Charnwood Molecular Ltd, The Heritage Building, 7 Beaumont Court, Prince William Road, Loughborough, Leicestershire LE11 5GA, U.K.