1. Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
2. Departamento de Química Físicay Analítica, C/Julián Clavería, 8, Oviedo 33006, Spain
3. Department of Chemistry, Diamond Harbour Women’s University, Diamond Harbour Road, Sarisha, South 24 Pgs, West Bengal 743368, India