1. Department of Chemistry and Biochemistry; University of Mississippi, MS; 38677 USA
2. Group for Molecular Engineering of Functional Materials; Institute of Chemical Sciences and Engineering; School of Basic Sciences; Swiss Federal Institute of Technology; 1951 Sion Switzerland
3. Laboratory for Photonics and Interfaces; Institute of Chemical Sciences and Engineering; School of Basic Sciences; Swiss Federal Institute of Technology; 1015 Lausanne Switzerland
4. Department of Metallurgical Engineerging and Materials Science; Indian Institute of Technology; Bombay, Powai; Mumbai 400-076 India