Abstract
X-ray diffraction analysis of four perfluorinated homophthalic (2-carboxymethylbenzoic) acids is carried out. In the crystals of 2-carboxymethyl-3,4,5,6-tetrafluorobenzoic acid (1) the chains (1D architecture) form with the usual dimeric carboxylic C(O)OH
O(HO)C synthon. The aromatic carboxylic group is disordered in the ratio 0.58:0.42 over two positions. In the crystals of 2-(carboxydifluoromethyl)-3,4,5,6-tetrafluorobenzoic (2) and 2-(1-carboxy-2,2,2-trifluoroethyl)-3,4,5,6-tetrafluorobenzoic acids (3) the layers (2D architecture) with dimeric and chain-like synthons C(O)OH...O(HO)C are found. In the crystals of 2-[methoxycarbonyl(difluoromethyl)]-3,4,5,6-tetrafluorobenzoic acid (4) only dimers (0D architecture) form with the chain synthon that incorporates both an ester and a carboxylic group. In the crystals of 1 and 2 intermolecular H-O...π interactions, in the crystals of 4 C-F...π interactions, and in 3 both types of interactions are observed.
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Original Russian Text Copyright © 2008 by T. V. Rybalova, Yu. V. Gatilov, Ya. V. Zonov, and V. M. Karpov
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Translated from Zhurnal Strukturnoi Khimii, Vol. 49, No. 4, pp. 769–774, May–June, 2008.
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Rybalova, T.V., Gatilov, Y.V., Zonov, Y.V. et al. Supramolecular architecture in the crystals of polyfluorinated homophthalic acids. J Struct Chem 49, 742–747 (2008). https://doi.org/10.1007/s10947-008-0104-6
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DOI: https://doi.org/10.1007/s10947-008-0104-6