The radical cationic salt of methylenedithiotetraselenafulvalene (MDT-TSF), shown in the picture, was formed on its treatment with AuI2−. The salt showed a superconducting transition at 4.5 K (onset) at ambient pressure. The crystal structure of the MDT-TSF cation is completely planar and stacked along its a-axis; the calculated overlap integral is five times greater in the intrastack compared to the interstack direction and the material is therefore quasi one-dimensional.
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Takimiya et al. (2001) studied this question.
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