Abstract
The crystal structure of the ammonium carboxylate salts (cyclohexylammonium)2·(terephthalate) (1), (cyclohexylammonium)2·(trans-1,4-cyclohexanedicarboxylate) (2) and (cyclododecylammonium)2·(trans-1,4-cyclohexanedicarboxylate) (3) were determined by low temperature single crystal X-ray diffraction. The molecular salts were prepared by solution crystallization of the carboxylic acids with the respective amines in a 1:2 stoichiometric ratio. The crystal structure of 1 belongs to the monoclinic space group Cc with a = 11.5643(7) Å, b = 22.8180(13) Å, c = 8.4163(5) Å and β = 117.020(2)°. The crystal structure of 2 belongs to the monoclinic space group P21/n with a = 16.9546(10) Å, b = 6.4352(4) Å, c = 19.3948(12) Å and β = 94.677(4)°. The crystal structure of 3 belongs to the monoclinic space group P21/c with a = 8.1714(5) Å, b = 34.3887(17) Å, c = 11.0230(6) Å and β = 95.790(4)°. The changes in cation and anion species produces three distinct types of layers, with corresponding changes in the hydrogen bonded ring patterns linking the ionic species together using charge-assisted N+–H···O− hydrogen bonds.
Index Abstract
The crystal structures of three ammonium carboxylate salts are determined and all form 2-D layers by virtue of having two carboxylate functional groups on their anion molecules.
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The University of the Witwatersrand and the Molecular Sciences Institute are thanked for providing the infrastructure and financial support required to do this work.
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Lemmerer, A. Two-Dimensional Layers Using Different Combinations of Hydrogen Bonded Rings in Three Ammonium Carboxylate Salts. J Chem Crystallogr 42, 338–344 (2012). https://doi.org/10.1007/s10870-011-0249-6
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DOI: https://doi.org/10.1007/s10870-011-0249-6