1. Department of Chemistry , University of Agriculture , Faisalabad , Pakistan
2. Department of Chemistry , The University of Lahore , Lahore , Pakistan
3. Department of Chemistry, Division of Science and Technology , University of Education , Lahore , Pakistan
4. Department of Physics , College of Sciences, Princess Nourah bint Abdulrahman University , P.O. Box 84428 , Riyadh 11671 , Saudi Arabia