Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 6 (June 2008)

organic compounds

sk3225 scheme

Acta Cryst. (2008). C64, o322-o325 [ doi:10.1107/S0108270108013024 ]

Two three-dimensional networks in the binary molecular adducts 4-methylimidazolium hydrogen terephthalate and bis(4-methylimidazolium) terephthalate

X.-G. Meng, Z.-D. Lin and A.-M. Li

Abstract: Both the 1:1 and 2:1 molecular adducts of 4-methylimidazole (4-MeIm) and terephthalic acid (H₂TPA) are organic salts, viz. C₄H₇N₂⁺·C₈H₅O₄^-, (I), and 2C₄H₇N₂⁺·C₈H₄O₄^2-, (II), respectively. The component ions in (I) are linked by N-HO and O-HO hydrogen bonds into continuous two-dimensional layers built from R₆⁴(32) hydrogen-bond motifs running parallel to the (100) plane. These adjacent two-dimensional layers are in turn linked by a combination of C-HO, C-H [pi] and [pi] - [pi] interactions into a three-dimensional network. In the crystal structure of (II), with the anion located on an inversion centre, only N-HO hydrogen bonds result in two-dimensional layers built from R₈⁸(42) hydrogen-bond motifs running parallel to the (102) plane. Being similar to those in (I), these layers are also linked by means of C-HO, C-H [pi] and [pi] - [pi] interactions, forming a three-dimensional network. This study indicates that, on occasion, a change of the reactant concentration can exert a pivotal influence on the construction of supramolecular structures based on hydrogen bonds.

Formula: C₄H₇N₂⁺·C₈H₅O₄^- and 2C₄H₇N₂⁺·C₈H₄O₄^2-


	Structure factor file (CIF format) (108.4 kbytes) [ doi:10.1107/S0108270108013024/sk3225Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (91.6 kbytes) [ doi:10.1107/S0108270108013024/sk3225IIsup3.hkl ] Contains datablock II

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