Abstract
From an aqueous mixture of 1,2,4,5-benzenetetracarboxylic acid, C6H2(CO2H)4, and KF we grew crystals first of KHF2 then of the title compound. An X-ray crystallographic determination of this compound shows a network of C6H2(CO −2 )4 units linked through hydrogen bonds to water molecules. This is the first reported structure of a benzenecarboxylate anion. Two carboxylate groups are coplanar with the benzene ring, whereas the other two are perpendicular to it.
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Emsley, J., Parker, R.J. & Kuroda, R. Potassium 1,2,4,5-benzenetetracarboxylate, C6H2(CO2K)4·4H2O; its formation, crystal structure, and hydrogen bonding. Journal of Crystallographic and Spectroscopic Research 16, 181–190 (1986). https://doi.org/10.1007/BF01161106
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DOI: https://doi.org/10.1007/BF01161106