Acta Cryst. (2003). E59, o1-o3  [ doi:10.1107/S1600536802021803 ]

Strong symmetrical intramolecular hydrogen bonds in diprotonated piperazinium bis(hydrogenmaleate)

Z. M. Jin, M. L. Hu, K. W. Wang, L. Shen and M. C. Li

Abstract: In the title salt, C₄H₁₂N₂²⁺·2C₄H₃O₄^-, the diprotonated piperazine cation links to two hydrogen maleate anions through N-HO hydrogen bonds. An H atom is approximately centered in an extremely short intramolecular hydrogen bond of the OHO type in each of the hydrogen maleate anions.

Online 7 December 2002

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