Abstract
In the crystal structure of the title compound, (C3H5N2)(NH4)[Cr2O7], the anions and cations are linked through N—H⋯O hydrogen bonds, resulting in a three-dimensional structure which contains three kinds of layers parallel to (001). One layer contains imidazole cations, the other two layers the ammonium cations and dichromate anions. The dichromate anion has an eclipsed conformation with a dihedral angle of 14.65 (18)° between the mean planes of the O—P—O—P—O backbone.
Highlights
In the crystal structure of the title compound, (C3H5N2)(NH4)[Cr2O7], the anions and cations are linked through N— HÁ Á ÁO hydrogen bonds, resulting in a three-dimensional structure which contains three kinds of layers parallel to (001)
The dichromate anion has an eclipsed conformation with a dihedral angle of 14.65 (18) between the mean planes of the O—P—O—P—O backbone
Related literature The title compound was synthesized as part of a search for ferroelectric materials
Summary
Key indicators: single-crystal X-ray study; T = 293 K; mean (C–C) = 0.005 A; R factor = 0.037; wR factor = 0.085; data-to-parameter ratio = 15.1. In the crystal structure of the title compound, (C3H5N2)(NH4)[Cr2O7], the anions and cations are linked through N— HÁ Á ÁO hydrogen bonds, resulting in a three-dimensional structure which contains three kinds of layers parallel to (001). One layer contains imidazole cations, the other two layers the ammonium cations and dichromate anions. The dichromate anion has an eclipsed conformation with a dihedral angle of 14.65 (18) between the mean planes of the O—P—O—P—O backbone. Related literature The title compound was synthesized as part of a search for ferroelectric materials. For general background to ferroelectric compounds with metal-organic framework structures, see: Fu et al (2009); Ye et al (2006); Zhang et al (2008, 2010). For graph-set motifs, see: Bernstein et al (1995)
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