Crystal structure of L -leucyl- L -isoleucine 2,2,2-trifluoroethanol monosolvate

Hydrophobic dipeptides with either L-Leu or L-Phe constitute a rather heterogeneous group of crystal structures. Some form materials with large water-filled channels, but there is also a pronounced tendency to incorporate organic solvent molecules, which then act as acceptors for one of the three H...

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Bibliographic Details
Published in:Acta crystallographica. Section E, Crystallographic communications Crystallographic communications, 2016-05, Vol.72 (5), p.635-638
Main Author: Görbitz, Carl Henrik
Format: Article
Language:English
Subjects:
crystal structure
dipeptide
head-to-tail chains
hydrogen bonds
layered structure
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Summary:Hydrophobic dipeptides with either L-Leu or L-Phe constitute a rather heterogeneous group of crystal structures. Some form materials with large water-filled channels, but there is also a pronounced tendency to incorporate organic solvent molecules, which then act as acceptors for one of the three H atoms of the charged N-terminal amino group. L-Leu-L-Ile has uniquely been obtained as two distinct hydrates, but has so far failed to co-crystallize with a simple alcohol. The present structure of C 12 H 24 N 2 O 3 ·CF 3 CH 2 OH, which crystallizes with two dipeptide and two solvent molecules in the asymmetric unit, demonstrates that when 2,2,2-trifluoroethanol is used as a solvent, its high capacity as a hydrogen-bond donor leads to formation of an alcohol solvate.
ISSN:2056-9890
2056-9890
DOI:10.1107/S2056989016005302