1. Crystallography and Crystal Chemistry Laboratory; Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal- 462066 Madhya Pradesh India
2. Current address: Max Planck Institute for Chemical Energy Conversion; Stiftstrasse 34-36 45470 Mülheim an der Ruhr Germany
3. Division of Physics; Faculty of Pure and Applied Sciences; University of Tsukuba; 1-1-1, Tennodai Tsukuba Ibaraki 305-8571 Japan