Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 10 (October 2004)

organic compounds

Acta Cryst. (2004). C60, o740-o743 [ doi:10.1107/S010827010401786X ]

Two N,N-dimethylbiguanidium salts displaying double hydrogen bonds to the counter-ions

L.-P. Lu, H.-M. Zhang, S.-S. Feng and M.-L. Zhu

Abstract: The crystal structures of N,N-dimethylbiguanidium oxalate monohydrate, C₄H₁₃N₅²⁺·C₂O₄^2-·H₂O, (I), and N,N-dimethylbiguanidium sulfate monohydrate, C₄H₁₃N₅²⁺·SO₄^2-·H₂O, (II), show that both compounds contain the same N,N-dimethylbiguanidium dication. In (I), two independent oxalate ions lie about inversion centres. Strong double hydrogen bonds, with DA distances of 2.658 (2) and 2.830 (3) Å in (I), and 2.722 (3) and 2.815 (3) Å in (II), are present between N atoms of the N,N-dimethylbiguanidium moieties and either the carboxylate group of the oxalate anion or the sulfate anion.

Formula: C₄H₁₃N₅²⁺·C₂O₄^2-·H₂O and C₄H₁₃N₅²⁺·SO₄^2-·H₂O


	Structure factor file (CIF format) (92.8 kbytes) Contains datablock I

	Structure factor file (CIF format) (85.6 kbytes) Contains datablock II

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