1. Department of Medical Physics, Anna University, Chennai−600 025, India
2. Department of Organic Chemistry, Science Faculty, Peoples’ Friendship University of Russia (RUDN University), MikluhoMaklaya St., 6, Moscow, Russia, 117198
3. Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai−600 025, India
4. Department of Physics, Periyar University, Salem−636 011, India
5. International Center for Young Scientists, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
6. Postdoctoral Research Fellow, University of Montreal, Saint−Justine Hospital University Center, 3175 Cote Sainte−Catherine, Montreal, Quebec H3T1C5, Canada