1. Analytical and Bio-analytical Laboratory, Department of Chemistry, Visva-Bharati, Santiniketan, West Bengal 731235, India
2. The West Bengal National University of Juridical Sciences, Dr. Ambedkar Bhavan, Kolkata 700098, India
3. Department of Chemistry, Jadavpur University, Main Campus 188, Raja S.C. Mallick Rd, Kolkata, West Bengal700032, India