1. Department of Chemistry, University of Engineering and Technology, Lahore, Pakistan;
2. Department of Physics, University of Sargodha, Sargodha, Pakistan;
3. Department of Chemistry, University of Aberdeen, Aberdeen, Scotland;
4. Department of Natural Sciences, University of Pitesti, Piteşti, Romania;
5. Pakistan Council of Scientific and Industrial Research (PCSIR) Laboratories Complex, Lahore, Pakistan