1. Chemistry Department, University of Alabama, Shelby Hall, Box 870336, Tuscaloosa, Alabama 35487-0336, Unidad de Servicios de Apoyo en Resolución Analítica, Universidad Veracruzana, A. P. 575, Xalapa, Veracruzana, México, Fundamental Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, and Department of Chemistry and Biochemistry, Northern Arizona University, South Beaver Street, Building 20, Room 125, Flagstaff, Arizona 86011-5698