1. Department of Chemistry, Sai Vidya Institute of TechnologyBangalore 560 064India
2. Research and Development Centre, Bharathiar UniversityCoimbatore 641 046India
3. Department of Chemistry, M.S. Ramaiah Institute of TechnologyBangalore 560 054India
4. Department of Studies and Research in Environmental Science, Tumkur UniversityTumkur 572 103India
5. C.N.R. Rao Centre for Advanced Material Research, Tumkur UniversityTumkur 572 103India
6. Department of Physics, B.M.S. Institute of TechnologyBangalore 560 064India