1. Synthetic Inorganic and Metallo-Organic Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, Uttar Pradesh, India;
2. Chemical Synthesis Laboratory, Department of Physics, University of Allahabad, Allahabad, Uttar Pradesh, India;
3. Department of Chemistry, Prof. Rajendra Singh (RajjuBhaiya) Institute of Physical Science for Study and Research, VBS Purvanchal University, Jaunpur, Uttar Pradesh, India