1. Department of Chemistry, Jadavpur University, Kolkata 700032, India
2. Department of Physics, M. G. Mahavidyalaya, Bhupatinagar, PurbaMedinipur, West Bengal 721425, India
3. School of Chemistry, The University of Manchester, Brunswick Street, Manchester, M13 9PL, United Kingdom
4. Departament de Química, Universitat de les Illes Balears, Crta. deValldemossa km 7.5, 07122 Palma, Baleares, Spain, http://www.jaduniv.edu.in