1. Department of Chemistry; University of Connecticut; Storrs CT 06269-3060 USA
2. Institute of Materials Science; University of Connecticut; Storrs CT 06269-3222 USA
3. Department of Chemistry; Faculty of Science; Tanta University; Tanta 31527 Egypt
4. Center for Functional Nanomaterials; Brookhaven National Laboratory; Upton NY 11973 USA
5. Photon Science Directorate; Brookhaven National Laboratory; Upton NY 11973 USA
6. Chemical and Biomolecular Engineering; University of Connecticut; Storrs CT 06269-3222 USA