1. Department of Physics, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695 547, Kerala, India
2. Central NMR Facility and Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India
3. Academy of Scientific and Innovative Research, CSIR- National Chemical Laboratory, Pune 411008, India
4. Catalysis and Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, Maharashtra, India