1. Department of Chemistry Aliah University New Town Kolkata 700 160 India
2. Department of Chemistry Jadavpur University Jadavpur Kolkata 700 032 India
3. Department of Physics Jadavpur University Jadavpur Kolkata 700 032 India
4. Department of Chemistry Mrinalini Datta Mahavidyapith Birati Kolkata 700 051 India