Molecular modelling and optical properties of a novel fluorinated chalcone oleh J.M.F. Custodio, J.J.A. Guimarães-Neto, R. Awad, J.E. Queiroz, G.M.V. Verde, M. Mottin, B.J. Neves, C.H. Andrade, G.L.B. Aquino, C. Valverde, F.A.P. Osório, B. Baseia, H.B. Napolitano