Specific Intermolecular Interactions of Urea, Uracile, and Their Derivatives
作者： Alexei K. Baev
DOI: 10.1007/978-3-642-37472-2_11
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摘要: 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 mixture mono crystals with tetragonal system, lattice constants which belong to structural class P421m, Z = 2(mm2), have values 0.5645, b c 0.4704 nm [2]. structures shapes needles stratiforms, layers consist plane prisms, formed peptide (amide) bonds >С=О•••Н–N< molecule has planar structure sufficiently electric moment dipole μ 4.6 D or ≈ 15.3•10−30 cm at 298 K [3] owing asymmetric distribution density n- π-bonding electrons.
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