1. Department of Chemistry, University of North Bengal, Darjeeling 734013, India
2. Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Nadia 741246, India
3. Department of Physics, Jadavpur University, Kolkata 700032, India
4. Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli PO, Mohali, Punjab 140306, India