1. Sciences Chimiques
de Rennes, Ecole Nationale Supérieure de Chimie de Rennes, 35708 Rennes Cedex 7, France
2. Department
of Chemistry and
Biochemistry, University of Northern Iowa, Cedar Falls, Iowa 50614-0423, United States
3. Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
4. Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States