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In the title compound, C7H7N2+·C9H7O4, hydrogen phenyl­malonate anions are connected by O—H...O hydrogen bonds to form zigzag chains. The chains are connected to each other by N—H...O hydro­gen bonds through benzimidazolium cations, forming a layer.

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The crystal structure of the title compound, C3H10N+·BF4, has been redetermined at 100 K and shows the BF4 anion to be ordered at this temperature. Both the anion and the cation lie on a mirror plane and they are connected by N—H...F and C—H...F hydrogen bonds.

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The title compound, C6H6NO2+·C6HCl2O4, is the salt of chloranilic acid with nicotinic acid (2-carboxy­piridine), where an acid–base inter­action involving a proton transfer is observed from the chloranilic acid to the pyridine group of nicotinic acid. In the crystal structure, the hydrogen chloranilate anion and the 2-carboxy­pridinium cation are linked by N—H...O and O—H...O hydrogen bonds to form a zigzag chain. The chains are further linked by O—H...O hydrogen bonds to form a three-dimensional hydrogen-bond network.
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