Реферат: International Union of Crystallography. We report a novel 1:1 cocrystal of β-alanine with dl-tartaric acid, C3H7NO2·C4H6O6, (II), and three new molecular salts of dl-tartaric acid with β-alanine {3-azaniumylpropanoic acid-3-azaniumylpropanoate dl-tartaric acid-dl-tartrate, [H(C3H7NO2)2]+·[H(C4H5O6)2]-, (III)}, γ-aminobutyric acid [3-carboxypropanaminium dl-tartrate, C4H10NO2 +·C4H5O6 -, (IV)] and dl-α-aminobutyric acid {dl-2-azaniumylbutanoic acid-dl-2-azaniumylbutanoate dl-tartaric acid-dl-tartrate, [H(C4H9NO2)2]+·[H(C4H5O6)2]-, (V)}. The crystal structures of binary crystals of dl-tartaric acid with glycine, (I), β-alanine, (II) and (III), GABA, (IV), and dl-AABA, (V), have similar molecular packing and crystallographic motifs. The shortest amino acid (i.e. glycine) forms a cocrystal, (I), with dl-tartaric acid, whereas the larger amino acids form molecular salts, viz. (IV) and (V). β-Alanine is the only amino acid capable of forming both a cocrystal [i.e. (II)] and a molecular salt [i.e. (III)] with dl-tartaric acid. The cocrystals of glycine and β-alanine with dl-tartaric acid, i.e. (I) and (II), respectively, contain chains of amino acid zwitterions, similar to the structure of pure glycine. In the structures of the molecular salts of amino acids, the amino acid cations form isolated dimers [of β-alanine in (III), GABA in (IV) and dl-AABA in (V)], which are linked by strong O-H.O hydrogen bonds. Moreover, the three crystal structures comprise different types of dimeric cations, i.e. (A.A)+ in (III) and (V), and A+.A+ in (IV). Molecular salts (IV) and (V) are the first examples of molecular salts of GABA and dl-AABA that contain dimers of amino acid cations. The geometry of each investigated amino acid (except dl-AABA) correlates with the melting point of its mixed crystal.The effect of amino acid backbone length on molecular packing has been studied using crystalline tartrates of glycine, β-alanine, γ-aminobutyric acid (GABA) and dl-α-aminobutyric acid (AABA) as examples.

Библиографическая ссылка: Losev E. , Boldyreva E.
The Effect of Amino Acid Backbone Length on Molecular Packing: Crystalline Tartrates of Glycine, β-Alanine, γ-Aminobutyric Acid (GABA) and dl-α-Aminobutyric Acid (AABA).
Acta Crystallographica Section C. 2018. V.74. N2. P.177-185. DOI: 10.1107/S2053229617017909 WOS Scopus РИНЦ CAPlus OpenAlex

Даты:

Поступила в редакцию:	8 нояб. 2017 г.
Принята к публикации:	14 дек. 2017 г.
Опубликована online:	18 янв. 2018 г.
Опубликована в печати:	1 февр. 2018 г.

Идентификаторы БД:

Web of science:	WOS:000424119400011
Scopus:	2-s2.0-85041468130
РИНЦ:	35489432
Chemical Abstracts:	2018:216035
OpenAlex:	W2783588097

Цитирование в БД:

БД	Цитирований
Web of science	14
Scopus	14
OpenAlex	13

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