1. Department of Chemistry, Acharya Nagarjuna University, Guntur, AP, India
2. Department of Chemistry, J.K.C.College, Guntur, Andhra Pradesh, India
3. Department of Physics, KoneruLakshmaiah Educational Foundation, Vaddeswaram, Guntur, District, India
4. Department of Chemistry, Andhra Loyola College, Acharya Nagarjuna University, vijayawada, AP, India