1. Department of Chemistry, Karunya Institute of Technology and Sciences (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India
2. Electro Organic-Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630 003, India
3. Department of Physics, Karunya Institute of Technology and Sciences (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India