1. Department of Chemistry and Biochemistry, Kennesaw State University, 370 Paulding Avenue, MD 1203, Kennesaw, Georgia 30144, USA
2. Department of Chemistry, Texas A&M University, 580 Ross Street, P.O. Box 30012, College Station, Texas 77842-3012, USA
3. Department of Chemistry, Clemson University, 379 Hunter Laboratories, Clemson, SC 29634-0973, USA