Abstract
Crystal-chemical analysis of the structures of oxalic acid and its salts Mx(C2O4)y·nH2O (n=0−3) is carried out. It is shown that the dimensions of oxalate ions play a critical role for closest packing in the structures of the acid and anhydrous and aqueous metal salts. In most compounds, the centers of masses of oxalate ions lie in the planes and form trigonal loops with average bond lengths and angles of 5–6 Å and 60°, respectively. The dimensions and distortions of the nets depend on the proximity of the cations and/or water molecules to the planes. For the structures of one cation, the influence of the quantity of water on the arrangement of oxalate ions is shown. The relationship between the polymorphism and variations of orientations and packings of oxalate ions is discussed. The analysis gives grounds for predicting the structural arrangement of ionic or molecular compounds provided that the structure-forming units have a pseudospherical form.
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Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Institute of Solid State Chemistry, Siberian Branch, Russian Academy of Sciences. Novosibirsk State University. Translated fromZhurnal Strukturnoi Khimii, Vol. 37, No. 3, pp. 550–578, May–June, 1996.
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Naumov, D.Y., Podberezskaya, N.V., Boldyreva, E.V. et al. Crystal-chemical analysis of the structures of oxalic acid and its salts M x (C2O4) y ·nH2O (n=0−3). J Struct Chem 37, 480–503 (1996). https://doi.org/10.1007/BF02578605
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DOI: https://doi.org/10.1007/BF02578605