1. Department of Chemistry University of Calcutta 92 APC Road Kolkata 700009 India
2. Department of Chemistry Presidency University 86/1 College Street Kolkata 700073 India
3. Department of Chemistry R. K. Mission Residential College, Narendrapur Kolkata 700103 India
4. Department of Chemistry Visva-Bharati (a Central University) Santiniketan 731 235 West Bengal India