DFT Study on Redox-Switchable Second-Order Nonlinear Optical Properties of ?5-Monocyclopentadienyliron(II) and Ruthenium(II) Complexes with Benzo[c]thiophene Nitrile Ligand - Mendes, Paulo J.; Ramalho, João P. Prates; Carvalho, A.J. Palace (2012)