1. Department of Chemistry; Universidad de los Andes; Carrera 1 N° 18 A-12 111711 Bogotá Colombia
2. Department of Chemistry, Biochemistry and Physics; Florida Southern College; 111 Lake Hollingsworth Drive Lakeland, FL 33801 USA.
3. Department of Chemistry; University of South Florida; 4202 East Fowler Ave. Tampa, FL 33620 USA.