1. Department of Chemistry, Bowling Green State University, Bowling Green, Ohio 43403, United States
2. Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
3. Department of Chemistry, Michigan State University, Lansing, Michigan 48824, United States
4. Dipartimento di Biotecnologie, Chimica e Farmacia, Università di Siena, via A. Moro 2, I-53100 Siena, Italy
5. Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 Université de Strasbourg-CNRS, F-67034 Strasbourg, France