A new radical cation salt bis(ethylenedithio)tetrathiafulvalene with [Pt(NO2)4]2− anion: Synthesis, structure, and conductivity

A radical cation salt based on bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) containing the [Pt(NO2)4]2− anion was synthesized for the first time. The crystal and molecular structure of this salt, (BEDT-TTF)2Pt(NO2)4, was established by X-ray diffraction analysis. The crystal structure consists of radical cation BEDT-TTF layers between which planar-square anions [Pt(NO2)4]2− are located. The layers are formed by BEDT-TTF stacks built of dimers. The interplanar distances within the dimers and between them are 3.41 and 3.96 A, respectively. The distribution of the bond lengths and bond angles in BEDT-TTF corresponds to the charge of the cation +1. The room-temperature conductivity of (BEDT-TTF)2Pt(NO2)4 is 3·10−3 Ω−1 cm−1, and the temperature dependence of the conductivity exhibits the semiconducting character.