1. Department of Chemistry, University of Delhi, Delhi 110 007, India
2. Postgraduate and Research Department of Chemistry, Muthurangam Government Arts College (Autonomous), Vellore 632 002, Tamil Nadu, India
3. Catalysis and Energy Laboratory, Department of Chemistry, Pondicherry University (A Central University), R. V. Nagar, Kalapet, Pondicherry 605 014, India