5-R-3H-1,2-Dithiole-3-thione (R = Ethylthio and Methylthio)

The title compounds, 5-ethylthio-3H-1,2-dithiole-3-thione, [C₅H₆S₄ (2)], and 5-methylthio-3H-1,2-dithiole-3-thione, [C₄H₄S₄ (3)], crystallize in space groups C2/c and P2₁/n, respectively. The molecules are planar, with heterocyclic characteristics similar to those shown by other members of the 3H-1,2-dithiole-3-thione family. The striking difference between the corresponding melting points [340-341 K for (2), 438-440 K for (3)] does not seem to arise from the rather similar main intermolecular interactions but rather from apparently much weaker ones.

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