1. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
2. Dipartimento di Chimica e Chimica Industriale, University of Pisa, Pisa, Italy
3. Department of Chemistry, Missouri State University, Springfield, Missouri 65879, USA
4. Department of Engineering, Swarthmore College, Swarthmore, Pennsylvania 19081, USA
5. Department of Chemistry, Haverford College, Haverford, Pennsylvania 19041, USA