1. Theoretical and Computational Chemistry Laboratory, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673 601, India
2. Department of Applied Chemistry, Cochin University of Science and Technology, Trikakkara, Kochi, Kerala 682 022, India
3. Inter University Centre for Nanomaterials and Devices, Cochin University of Science and Technology, Trikakkara, Kochi, Kerala 682 022, India