1. Department of Chemistry, University of Virginia, 409 McCormick Rd., Charlottesville, VA 22904, USA
2. Department of Chemistry, Missouri University of Science and Technology, 142 Schrenk Hall, 400 W. 11th St., Rolla, MO 65409, USA
3. Department of Natural Sciences, University of Virginia's College at Wise, 1 College Avenue, Wise, VA 24293, USA
4. Department of Chemistry “G. Ciamician”, University of Bologna, via S. Alberto 163, Ravenna, 48123, Italy