In 2022, we reported that the β″-(BEDT-TTF)ClCHSO salt () has a phase transition at 210 K on cooling and 260 K on heating, which was suggested as a nondoped-to-doped transition. During the synthesis of , a second salt was coproduced, the structure and properties of which are reported here. The new salt β″-β″-(BEDT-TTF)ClCHSO () has the same composition and is isomorphous to , the low-temperature phase of .
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