1. Department of Chemistry, New Mexico Highlands University, Las Vegas, New Mexico 87701, United States
2. Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53233, United States
3. Department of Chemistry and Biochemistry, The University of Texas at El Paso, El Paso, Texas 79968, United States
4. Department of Natural Science, Hawaii Pacific University, Honolulu, Hawaii 96813, United States