New hydrophobic l-amino acid salts: Maleates of l-leucine, l-isoleucine and l-norvaline

    Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

    18 Цитирования (Scopus)


    Crystals of maleates of three amino acids with hydrophobic side chains [l-leucenium hydrogen maleate, C6H14NO2 +.C4H3O4 -, (I), l-isoleucenium hydrogen maleate hemihydrate, C6H14NO2 +.C4H3O4 -.0.5H2O, (II), and l-norvalinium hydrogen maleate-l-norvaline (1/1), C5H11NO2 +.C4H3O4 -.C5H12NO2, (III)], were obtained. The new structures contain C22(12) chains, or variants thereof, that are a common feature in the crystal structures of amino acid maleates. The l-leucenium salt is remarkable due to a large number of symmetrically non-equivalent units (Z′ = 3). The l-isoleucenium salt is a hydrate despite the fact that l-isoleucine is a nonpolar hydrophobic amino acid (previously known amino acid maleates formed hydrates only with lysine and histidine, which are polar and hydrophilic). The l-norvalinium salt provides the first example where the dimeric cation l-Nva⋯l-NvaH+ was observed. All three compounds have layered noncentrosymmetric structures. Preliminary tests have shown the presence of the second harmonic generation (SGH) effect for all three compounds.

    Язык оригиналаанглийский
    Страницы (с-по)584-592
    Число страниц9
    ЖурналActa Crystallographica Section C: Structural Chemistry
    СостояниеОпубликовано - 1 июл. 2015


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