1. Department of Chemistry, Srikrishna College, Bagula-741502, Nadia, West Bengal, India.
2. Department of Chemistry, Chandidas Mahavidyalaya, Khujutipara – 731215, Birbhum, West Bengal, India.
3. Department of Chemistry, Jadavpur University, Kolkata – 700032, West Bengal, India.
4. Institut für Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, D-91058 Erlangen, Germany.