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Redetermination of the solvent-free crystal structure of l-proline.

ABSTRACT: The title compound, (S)-pyrrolidine-2-carb-oxy-lic acid (C5H9NO2), commonly known as l-proline, crystallized without the inclusion of any solvent or water mol-ecules through the slow diffusion of diethyl ether into a saturated solution of l-proline in ethanol. l-Proline crystallized in its zwitterionic form and the mol-ecules are linked via N-H⋯O hydrogen bonds, resulting in a two-dimensional network. In comparison to the only other publication of a single-crystal structure of l-proline without inclusions [Kayushina & Vainshtein (1965 ▸). Kristallografiya, 10, 833-844], the R1 value is significantly improved (0.039 versus 0.169) and thus, our data provides higher precision structural information.

SUBMITTER: Koenig JJ 

PROVIDER: S-EPMC6072995 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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Redetermination of the solvent-free crystal structure of l-proline.

Koenig Jonas J JJ   Neudörfl Jörg-M JM   Hansen Anne A   Breugst Martin M  

Acta crystallographica. Section E, Crystallographic communications 20180710 Pt 8

The title compound, (<i>S</i>)-pyrrolidine-2-carb-oxy-lic acid (C<sub>5</sub>H<sub>9</sub>NO<sub>2</sub>), commonly known as l-proline, crystallized without the inclusion of any solvent or water mol-ecules through the slow diffusion of diethyl ether into a saturated solution of l-proline in ethanol. l-Proline crystallized in its zwitterionic form and the mol-ecules are linked <i>via</i> N-H⋯O hydrogen bonds, resulting in a two-dimensional network. In comparison to the only other publication of a  ...[more]

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