1. Department of Chemistry; Oxford Engineering College; Tiruchirappalli 620 009 India
2. Department of Chemistry; Coimbatore Institute of Technology; Coimbatore 641 014 India
3. Functional Materials Division; Central Electrochemical Research Institute; Karaikudi 630 006 India
4. PG and Research Department of Chemistry; Jamal Mohamed College (Autonomous); Tiruchirappalli 620 020 India