X-ray crystal structure and electrical conductivity of [Pt(2,2′-bipyridine)(C 8 H 4 S 8 )][BF 4 ] [C 8 H 4 S 8 =2-{(4,5-ethylenedithio)-1,3-dithiole-2-ylidene}-1,3-dithiole-4,5-dithionate(2-)]

[Pt(bpy)(C 8 H 4 S 8 )][BF 4 ] (bpy=2,2′-bipyridine; C 8 H 4 S 8 =2-{(4,5-ethylenedithio)-1,3-dithiole-2-ylidene}-1,3-dithiole-4,5-dithionate(2-)) was prepared by current-controlled electrolysis of a dichloromethane solution of [Pt(bpy)(C 8 H 4 S 8 )] with [NEt 4 ][BF 4 ] as an electrolyte. The X-ray crystal structure analysis revealed a columnar stacking of the one-electron oxidized, cationic moieties with some S-S non-bonded contacts (<3.7 A˚) as well as an S-S layered interaction in another direction. The electrical conductivity measured for a compacted pellet was 5.0×10 S cm at room temperature with activation energy of 0.05 eV. The energy band calculation of the oxidized species showed an essentially one-dimensional electron-conduction through the column.