1. School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom
2. Département de Chimie, Ecole Normale Supérieure, URA CNRS 1679, 24 Rue Lhomond, 75231 Paris Cédex 5, France
3. ICI Acrylics, P.O. Box 90, Wilton, Middlesbrough, Cleveland TS90 8JE, United Kingdom