1. Department of Chemistry, Kumaun University, Nainital-263002, Uttarakhand, India
2. CSIR-CIMAP, Research Center, Pantnagar-263149, Uttarakhand, India
3. Department of Chemistry, College of Basic Sciences and Humanities, GBPUAT, Pantnagar-263145, Uttarakhand, India
4. Department of Chemistry, Uttarakhand Open University, Haldwani 263139, India