1. Department of Chemistry, Koneru Lakshmaiah Education Foundation 1 , Hyderabad 500 075, India
2. Department of Physics, Qufu Normal University 2 , Qufu, China
3. Department of Physics, Universidade Federal do Espírito Santo 3 , 29075-910 Vitória, Brazil
4. Department of Chemistry, and Chemistry Centre, University of Coimbra 4 , 3004-535 Coimbra, Portugal