1. The University of Iowa, Department of Chemistry, E331 Chemistry Building, Iowa City, IA 52242, USA
2. The University of South Dakota, Department of Chemistry, 414 E Clark St., Vermillion SD, 57069, USA
3. Michigan State University, Department of Chemistry, 578 South Shaw Lane, East Lansing, Michigan 48824, USA
4. The Ohio State University, Department of Chemistry and Biochemistry, 100 West 18th Ave, Columbus, OH 43210, USA