1. Department of Chemistry; University of North Bengal; Darjeeling 734013, West Bengal India
2. Department of Electrical Engineering; Temple University; Philadelphia 741235 USA
3. Department of Chemical Sciences; Indian Institute of Science Education and Research Mohali, S.A.S. Nagar, Manauli PO; Mohali 140 306 India
4. Department of Chemistry; University of Kalyani, Kalyani; 741235, West Bengal India
5. Department of Chemistry; Dinobandhu Andrews College; Kolkata 700084,West Bengal India