1. Department of Chemistry, Institute of Natural Sciences, University of Gujrat, Gujrat, Pakistan,
2. Department of Chemistry, University of Sargodha, Bhakkar, Pakistan,
3. Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, Pakistan,
4. Institute of Biochemistry and Biotechnology, University of the Punjab, Lahore, Pakistan,
5. Department of Physics, COMSATS CIIT, Islamabad, Pakistan, and
6. Chemistry Department, College of Science, King Saud University, Riyadh, Saudi Arabia