1. Department of Chemistry, National Institute of Technology Sikkim, Ravangla, Sikkim 737139, India
2. School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
3. Department of Chemistry, Bangabasi Morning College, 19, Rajkumar Chakraborty Sarani, Kolkata-700009, India