1. Department of Chemistry, PSG College of Technology, Coimbatore 641004, India
2. Department of Physics, Dr. Mahalingam College of Engineering and Technology, Pollachi 642003, Tamil Nadu, India
3. Department of Chemistry, National Institute of Technology, Silchar 788010, Assam, India
4. Department of Chemistry, VHNSN College, Virudhunagar 626 001, Tamil Nadu, India