1. Department of Chemistry; Assam University, Silchar; Assam-788011 India
2. Chemistry Program; New York University Abu Dhabi, Experimental Research Building (C1), Saadiyat Island; United Arab Emirates
3. Laboratoire de Photonique Quantique et Moléculaire UMR CNRS 8531; ENS Paris Saclay, CentraleSupelec - 61 avenue du Président Wilson; 94235 Cachan France
4. Centre for Nano and Soft Matter Sciences; Prof. U. R. Rao Road, Post Box No. 1329, Jalahalli Bangalore−560 013 India