1. Department of Chemical Sciences, Tezpur University, Assam 784028, India
2. Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
3. Cotton University, Panbazar, Guwahati, Assam 781001, India
4. Department of Chemistry, S.B. Deorah College, Ulubari, Guwahati, Assam, India