1. Department of Chemistry, Mrinalini Datta Mahavidyapith, Kolkata 700 051, India
2. Department of Chemistry, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, India
3. Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
4. Division of Chemical Science, Indian Institute of Science Education and Research, Kolkata 741 246, India