1. Department of Chemistry; Case Western Reserve University; 10900 Euclid Ave. Cleveland OH 44106 USA
2. Department of Electrical and Computer Engineering; University of California San Diego; 9500 Gilman Drive La Jolla CA 92093 USA
3. Department of Chemistry, Biomedical Research Lab; VHNSN College (Autonomous); 3/151-1,College Road, Virudhunagar Tamil Nadu 626001 India