1. Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
2. Department of Environmental Engineering, Norwegian Geotechnical Institute (NGI), P .O. Box 3930, Ullevål Stadion, NO-0806 Oslo, Norway
3. Department of Chemistry, College of Wooster, 943 College Mall, Wooster, Ohio 44691, United States
4. Department of Chemistry, York University, 4700 Keele Street, Toronto M3J 1P3, Ontario, Canada