1. Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
2. Facultad de Ciencias, Universidad Central de Venezuela, Caracas 1020-A Venezuela
3. Zoneca-CENEX, R&D Laboratories, Alta Vista, 64770 Monterrey, México
4. Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
5. Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794, United States
6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States