1. Department of Chemistry, Acharya Nagarguna University, Guntur, Andhra Pradesh 522510, India
2. Department of Chemistry, Sri Krishna Devaraya University, Anantapur, Andhra Pradesh 515003, India
3. Department of Chemistry, University college of Engineering (Autonomous), Jawaharlal Nehru Technological University, Kakinada, Andhra Pradesh 533 003, India