The bis­(ethyl­enedithio)­tetra­thia­fulvalene-based ionic charge-transfer complex with 2,3-dichloro-5,6-di­cyano-p-benzoquinone

In the ionic charge-transfer (CT) complex composed of bis­(ethyl­enedithio)­tetra­thia­fulvalene (ET) and 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), C₁₀H₈S₈·C₈Cl₂N₂O₂, the donor and acceptor mol­ecules both form centrosymmetric dimers associated by strong face-to-face [pi]-[pi] inter­actions. The disordered DDQ mol­ecules form a one-dimensional [pi]-stacked column, while the ET mol­ecules form a two-leg ladder through additional short S...S contacts between adjacent [pi]-[pi]-bonded dimers. The crystal structure of ET-DDQ revealed in this study will provide a valuable example of the two-leg spin ladder system, which has rarely been reported for ET-based CT complexes.