1. Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, Institute of Materials Science, NCSR “Demokritos”, 15310 Ag. Paraskevi, Attiki, Greece, Department of Biological Applications and Technologies, University of Ioanninna, 45110 Ioannina, Greece, and Department of Chemistry, University of California, Davis, California 95616