1. Department of Chemistry; Science and Arts College; Rabigh Campus; King Abdulaziz University; Jeddah Saudi Arabia
2. H. E. J. Research Institute of Chemistry; International Center for Chemical and Biological Sciences; University of Karachi; Karachi- 75270 Pakistan
3. Department of Chemistry; Forman Christian College (A Chartered University); Ferozepur Road- 54600 Lahore Pakistan