Abstract
The derivatives of the β-tautomer (isourea) are characterized by strong basic properties, forming ions H2NCON3 + and H2NC(NH)O− in a water environment [1]. “Pure” crystalline urea is a mixture of mono crystals with a tetragonal system, the lattice constants of which belong to the structural class P421m, Z = 2(mm2), and have the values a = 0.5645, b = 0.5645, and c = 0.4704 nm [2]. The crystalline structures of urea have the shapes of needles and stratiforms, the layers of which consist of plane prisms, formed by peptide (amide) bonds >С=О•••Н–N< [1]. The urea molecule has a planar structure with a sufficiently strong electric moment of dipole μ = 4.6 D or ≈ 15.3•10−30 cm at 298 K [3] owing to the asymmetric distribution of the density of n- and π-bonding electrons.
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Baev, A.K. (2014). Specific Intermolecular Interactions of Urea, Uracile, and Their Derivatives. In: Specific Intermolecular Interactions of Nitrogenated and Bioorganic Compounds. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37472-2_11
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