Piperazine–4,4'-Sulfonyldiphenol (1/2): a Self-Assembled Channel Structure

Interaction of piperazine with 4,4′-sulfonyl­diphenol at ambient temperature in methanol yields the salt, piperazin-1,4-diium di(4,4′-sulfonyldiphenolate), (C₄H₁₂N₂)²⁺.2(C₁₂H₉O₄S)⁻ in which pairs of phenolate anions form cyclic dimers; the cations act as multiple hydrogen-bond donors, of both N-H...O and C-H...O types, which tie these dimers into stacks enclosing channels 4.3 Å in diameter.

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