1. Department of Chemistry, University of Malakand, Khyber Pakhtunkhwa, Pakistan;
2. Department of Physics, University of Sargodha, Sargodha, Punjab, Pakistan;
3. Anorganische Chemie II, Universität Bayreuth, Bayreuth, Germany;
4. Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Pakistan;
5. Department of Chemistry, University of Gujrat, Punjab, Pakistan