1. Department of Chemistry, Vignan's Institute of Information Technology, Duvvada, Visakhapatnam-530049, India
2. School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa
3. Department of Chemistry, GITAM Institute of Science, GITAM University, Visakhapatnam 530045, Andhra Pradesh, India