1. 1School of Chemistry, Madurai Kamaraj University, Madurai-625021, Tamilnadu, India.
2. 2Department of Chemistry, C.P.A. College, Bodinayakanur- 625582, Tamilnadu, India.
3. 4Directorate of Distance Education, Madurai Kamaraj University, Madurai-625 021, Tamilnadu, India.
4. 3Department of Chemistry, Thiagarajar College, Madurai - 625009, Tamilnadu, India.