1. Department of Chemistry; National Institute of Technology; Silchar 788010 Assam India
2. Department of Chemistry; Handique Girls’ College; Guwahati 781001 Assam India
3. Department of Chemistry; Johns Hopkins University, 3400 North Charles Street; Baltimore Maryland 21218
4. Department of Molecular Biology and Biotechnology; Tezpur University; Tezpur 784028 Assam India
5. Department of Chemical Sciences; Tezpur University; Tezpur 784028 Assam India