Инд. авторы:	Arkhipov S.G., Rychkov D.A., Pugachev A.M., Boldyreva E.V.
Заглавие:	New hydrophobic L-amino acid salts: maleates of L-leucine, L-isoleucine and L-norvaline
Библ. ссылка:	Arkhipov S.G., Rychkov D.A., Pugachev A.M., Boldyreva E.V. New hydrophobic L-amino acid salts: maleates of L-leucine, L-isoleucine and L-norvaline // Acta crystallographica. Section C, Structural chemistry. - 2015. - Vol.71. - P.584. - ISSN 2053-2296.
Внешние системы:	DOI: 10.1107/S2053229615010888; PubMed: 26146397; SCOPUS: 2-s2.0-84937417916; WoS: 000357602800012;
Реферат:	eng: Crystals of maleates of three amino acids with hydrophobic side chains [L-leucenium hydrogen maleate, C6H14NO2+center dot C4H3O4-, (I), L-isoleucenium hydrogen maleate hemihydrate, C6H14NO2+center dot C4H3O4-center dot 0.5H(2)O, (II), and L-norvalinium hydrogen maleate-L-norvaline (1/1), C5H11NO2+center dot C4H3O4-center dot C5H12NO2, (III)], were obtained. The new structures contain C-2(2)(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 center dot center dot center dot 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.
Ключевые слова:	150 K; X-RAY; L-HISTIDINE; MALEIC-ACID; SINGLE-CRYSTALS; L-PHENYLALANINIUM MALEATE; NONLINEAR-OPTICAL MATERIAL; L-ARGININE MALEATE; L-ALANINIUM MALEATE; L-norvaline; L-isoleucine; L-leucine; crystal structure; SHG effect; L-norvaline-L-norvalinium dimer; noncentrosymmetric layered structures; maleate; L-amino acids; GROWTH;
Издано:	2015
Физ. характеристика:	с.584