1. 1Department of Chemistry, JNTUA, Ananthapuramu, A.P, India.
2. 2Department of Chemistry, Sri Kalahasteewara Institute of Technology, Srikalahasti, Chittoor Dist, A.P, India.
3. 3Department of Chemistry, JNTUA College of Engineering, Pulivendula, YSR Kadapa, A.P, India.