1. Department of Organic Chemistry, Indian Association for the Cultivation of Science, Raja S. C. Mullick Road, Kolkata 700032, India
2. Department of Chemistry, University of Calcutta, 92, A. P. C Road, Kolkata 700009, India
3. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Raja S. C. Mullick Road, Kolkata 700032, India, http://www.iacs.res.in/inorg/icrm/