1. Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Road, San Diego, California 92182-1030, United States
2. Department of Chemistry, University of Texas Rio Grande Valley, Brownsville, Texas, United States
3. Department of Chemistry and Biochemistry, Division of Natural Sciences, College of Mount Saint Vincent, 6301 Riverdale Avenue, Riverdale, New York 10471, United States
4. Department of Chemistry, Wesleyan University, 52 Lawn Avenue, Middletown, Connecticut 06459, United States