Affiliation: | 1. Department of Chemistry, University College of Science, 92 A.P.C. Road, Calcutta 700 009, India;2. Department of Chemistry, Sree Chaitanya College, Habra, North 24 Parganas, West Bengal, India;3. Department of Chemistry, St. Paul’s C.M. College, 33/1, Raja Rammohan Roy Sarani, Calcutta 700 009, India;4. Department of Chemistry, Howard University, 2400 Sixth Street, NW, Washington, DC 200 59, USA |