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In the crystal of the title compound, C7H9N3O4, mol­ecules are linked by weak C—H...O hydrogen bonds into chains along the a-axis direction. The dihedral angle between the ring and the nitro group is 3.03 (6), while that between the ring and the acetate group is 85.01 (3)°.

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The crystal packing of the title salt, C6H11N2O+·I3, can be described as consisting of alternating layers of cations and anions parallel to the (100) plane along the a-axis direction. The components are linked by O—H...I, C—H...I and C—H...O interactions, generating a three-dimensional network. The O atom deviates from the imidazol ring by 0.896 (2) Å.

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In the cation of the title compound, C10H13N2O+·I, all non-H atoms, with the exception of the O atom, are essentially coplanar, with a maximum deviation of 0.04 (1) Å. In the crystal, the cations and anions are arranged in layers parallel to (100). The cations are connected to the anions via an O—H...I hydrogen bond and there are significant π–π stacking inter­actions between cation layers, with centroid–centroid distances in the range 3.606 (5)–3.630 (5) Å. A weak intra­molecular C—H...O hydrogen bond is also observed. The crystal studied was an inversion twin with refined components of 0.52 (5) and 0.48 (5).
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