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

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The crystal structures of N,N-di­methyl­biguanidium oxalate monohydrate, C4H13N52+·C2O42−·H2O, (I), and N,N-di­methyl­biguanidium sulfate monohydrate, C4H13N52+·SO42−·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 D…A 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.

Document Type: Research Article


Publication date: October 1, 2004

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