1. Department of Chemistry; Mar Thoma College; Kuttapuzha P.O. Tiruvalla Kerala 689103 India
2. International and Interuniversity Centre for Nanoscience and Nanotechnology; Mahatma Gandhi University; Priyadarsini Hills P.O. Kottayam Kerala 686560 India
3. Department of Chemistry; C.M.S College; Kottayam Kerala 686001 India