A 1:2 Host–Guest Complex of Diaza-15-crown-5 with Picric Acid

In (C₁₀H₂₄N₂O₃)²⁺.2(C₆H₂N₃O₇)⁻, the crown ether, 1,4,10-trioxa-7,13-diazacyclopentadecane (diaza-15-crown-5), exists as a dication by accepting protons from two trinitrophenol (picric acid) molecules. The crown ether shows disorder due to the two uniangular conformations at C3 and C4. The anions are stacked between the dications and are connected to them by N-H...O hydrogen bonds to form columns of interleaved ions. The crystal structure is stabilized by N-H...O and C-H...O hydrogen bonds.

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