1. Department of Chemistry; Quaid-i-Azam University; Islamabad 45320 Pakistan
2. Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt; Max-von-Laue-Str. 7 60438 Frankfurt/Main Germany
3. Sulaiman Bin Abdullah Aba Al Khail Centre for Interdisciplinary Research in Basic Sciences (SA-CIRBS); International Islamic University; Islamabad 44000 Pakistan
4. Department of Physics; University of Sargodha; Sargodha Pakistan
5. HEJ Research Institute of Chemistry, International Center for Chemical and Biological Sciences; University of Karachi; Karachi 75270 Pakistan