1. Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany;
2. Department of Chemistry, University of Science and Technology Bannu, Bannu, Pakistan;
3. Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany;
4. Department of Chemistry, Baghdad-ul-Jadeed Campus, The Islamia University of Bahawalpur, Bahawalpur, Pakistan;
5. Department of Industrial Chemistry, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia