1. Department of Chemistry, The University of Burdwan, Burdwan 713104, West Bengal, India, http://www.buruniv.ac.in/
2. Department of Zoology, Visva Bharati University, Santiniketan 731235, West Bengal, India
3. Departamento de Química Inorgánica, Facultade de Química, Avda. Das Ciencias s/n, 15782 Santiago de Compostela, Spain