Affiliation: | 1. Department of Chemistry , University of Edinburgh , West Mains Road, Edinburgh, EH9 3JJ, Scotland;2. B.P. Research Centre , Chertsey Road, Sunbury-on-Thames, Middlesex, TW16 7LN, England;3. Department of Chemistry , University of Edinburgh , West Mains Road, Edinburgh, EH9 3JJ, Scotland;4. B.P. Research Centre , Chertsey Road, Sunbury-on-Thames, Middlesex, TW16 7LN, England |