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The organic donor molecule PEDT-TTF (3,4-pyrazino-3',4'-ethylenedithio- 2,2',5,5'-tetrathiafulvalene) forms a semiconducting 3:1 solvate salt with TlI4- in TCE (1,1,2-trichloroethane), (C10H6N2S6)3+.TlI4-.C2H3Cl3. Its crystal structure contains stacks with six sinusoidally displaced PEDT-TTF molecules per repeat unit. However, the topology of short intermolecular S
S interactions is one dimensional in the transverse direction which coincides with the direction of the most developed crystal growth.
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