1. Synthetic Inorganic and Metallo-Organic Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad, India;
2. Department of Chemistry, Kamla Nehru Institute of Physical and Social Sciences, Sultanpur, India;
3. Department of Chemistry, Prof. Rajendra Singh (Rajju Bhaiya) Institute of Physical Sciences for Study & Research, VBS Purvanchal University, Jaunpur, India;
4. Department of Chemistry, Rajkiya Engineering College, Deogaon, Azamgarh, India