Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 1 (January 2012)

organic compounds

Acta Cryst. (2012). E68, o18-o19    [ doi:10.1107/S1600536811051105 ]

1,1-Dimethyl­biguanidium(2+) dinitrate

M. Fridrichová, I. Císarová and I. Nemec

Abstract: In the crystal structure of the title compound, C4H13N52+·2NO3-, the main inter­molecular inter­actions are the N-H...O hydrogen bonds between the cationic amino groups and the O atoms of the nitrate ions. All amino H atoms and nitrate O atoms are involved in the three-dimensional hydrogen-bond network. There are two graph-set motifs R22(8), which include the amino groups connected to the N atoms in the biguanide 3-, 4- and 5-positions, and the O atoms of a nitrate ion. They are extended along the a axis. An O atom of the second nitrate ion is involved in a graph-set motif C(4) that is a part of a helix-like N-H...O...H-N-H...O... chain oriented along the b axis. There are also two weak C-H...O inter­actions in the crystal structure.

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