To the memory of Professor G.I. Koldobskii
Abstract
It was shown by the method of powder X-ray diffraction analysis that in the crystalline state the product of the reaction of thiourea with chloroacetic acid in water, (carbamimidoylsulfanyl)acetic acid, existed in the zwitter-ion tautomeric form. The structure consists of virtually planar infi nite layers normal to the c axis of the unit cell which are bound by van der Waals interactions. The layers are formed by infi nite rows elongated along the b axis of the unit cell consisting of materially planar zwitter-ionic molecules linked by strong bifurcated hydrogen bonds. The results of quantum-chemical calculations by PM6 method are in agreement with the XRD results: whereas an isolated molecule exists in nonzwitter-ionic tautomeric form, in the crystal only the zwitterionic tautomer is present.
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Original English Text © V.S. Fundamenskii, S.M. Ramsh, V.A. Brouskov, A.V. Smirnova, A.Yu. Yanichev, M. B. Fleisher, S.V. Belyakov, 2013, published in Zhurnal Organicheskoi Khimii, 2013, Vol. 49, No. 5, pp. 690–696.
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Fundamenskii, V.S., Ramsh, S.M., Brouskov, V.A. et al. Study of the structure of (carbamimidoylsulfanyl)acetic (“pseudothiohydantoic”) acid by XRD and PM6 methods. Russ J Org Chem 49, 672–677 (2013). https://doi.org/10.1134/S1070428013050060
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DOI: https://doi.org/10.1134/S1070428013050060