Abstract
THE accurate crystal structure analyses of α-oxalic acid1 and oxalic acid dihydrate2 show that the length of the central C—C bond is indistinguishable from the single bond-length of 1.5445 A. in diamond within a probable limit of ± 0.025 A. It is inferred that there is no appreciable degree of π-conjugation across the central bond, presumably because of polarization of the carbon 2p electrons by the oxygen atoms; some other explanation must therefore be sought for the fact that the oxalic acid molecule is perfectly flat in both α and β anhydrous forms and in the dihydrate. It seems unlikely that in all three crystal structures the intermolecular hydrogen-bonding system should be specifically that of lowest energy only when the molecules are planar. In both the α anhydrous form and the dihydrate, the C—O bonds are distinguishable in length, one tending towards a double bond, the other towards a single bond. The centre of symmetry of the molecule requires a trans relationship between the bonds as in (I).
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References
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JEFFREY, G., PARRY, G. Evidence for Intramolecular Attraction between Hydroxyl and Carbonyl Oxygen Atoms. Nature 169, 1105–1106 (1952). https://doi.org/10.1038/1691105b0
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DOI: https://doi.org/10.1038/1691105b0
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