1. Department of Chemistry National Institute of Technology Manipur Langol, Imphal 795004 Manipur India
2. Department of Chemistry Indian Institute of Technology Guwahati Guwahati 781 039 Assam India
3. Department of Chemistry National Institute of Technology Agartala Agartala Tripura 799046 India
4. Materials Research Institute The Pennsylvania State University University Park PA-16802 United States
5. Department of Chemistry Central University of Punjab Bathinda 151001 Punjab India
6. Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh 11451 Saudi Arabia