1. Department of Chemistry, Inorganic Section, Jadavpur University, Kolkata 700032, India
2. Department of Physics, Sreegopal Banerjee College, Hooghly 712148, West Bengal, India
3. Department of Physics, Jadavpur University, Kolkata 700032, India
4. Department of Chemistry, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Spain
5. School of Chemistry, The University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, UK
6. Department of Higher Education, (University Branch) Government of West Bengal, Bikash Bhavan, Salt Lake, Kolkata-91, India