1. Department of Chemistry, J. B. College, Jorhat, Assam, India
2. Department of Chemistry, Cotton University, Guwahati, Assam, India
3. Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany
4. Department of Chemical Science, Tezpur University, Tezpur, Napam, Assam, India
5. Department of Chemistry, Jorhat Institute of Science and Technology, Jorhat, Assam, India