1. Department of Physics and Chemistry, Mahatma Gandhi Institute of Technology (MGIT), Gandipet-500075, Hyderabad, Telangana, India
2. Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502284, Sangareddy, Telangana, India
3. Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstr. 15 Geb. 30.45, 76131 Karlsruhe, Germany