1. Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K., Department of Chemistry, University of Leicester, Leicester LE1 7RH, U.K., Department of Inorganic Environmental Chemistry, Chalmers University of Technology, 41296 Göteborg, Sweden, Aventis CropScience UK Ltd, Chesterford Park, Saffron Walden, Essex, CB10 1XL, U.K., and Department of Physical Chemistry, Slovak Technical University, SK-812 37 Bratislava, Slovakia