Acta Crystallographica Section C
Crystal Structure Communications
Volume 64, Part 6 (June 2008)
Two three-dimensional networks in the binary molecular adducts 4-methylimidazolium hydrogen terephthalate and bis(4-methylimidazolium) terephthalate
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+·C8H4O42-, (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 and - 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 and - 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+·C8H4O42-Notes:
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