1. Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata – 700118, India
2. Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
3. Department of Chemical Sciences, University of Johannesburg, P.O. Box 524, Auckland Park 2006, Kingsway Campus, South Africa