Low temperature/high pressure polymorphism in dl-cysteine

Vasily S. Minkov, Nikolay A. Tumanov, Raul Quesada Cabrera, Elena V. Boldyreva

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We compare the response of the crystalline dl-cysteine to cooling and to increasing pressure. The structure undergoes a low-temperature phase transition into an isosymmetric polymorph, dl-cysteine-II, with the conformation of zwitterion changing from gauche- to gauche+. The first pressure-induced transition at 0.1 GPa (the lowest pressure reported for a phase transition in a crystalline amino acid thus far) gives the same polymorph. Further compression of dl-cysteine-II proceeds differently on cooling and with increasing hydrostatic pressure. dl-cysteine-II is preserved down to 3 K, but undergoes phase transitions on compression at about 1.55 GPa, and 6.20 GPa. The changes in the hydrogen bond network preceding the phase transition in dl-cysteine-II in the range 0.25-0.85 GPa differ from those observed on cooling the same structure, but resemble those preceding pressure-induced phase transitions in β- and γ-glycine.

langue originaleAnglais
Pages (de - à)2551-2560
Nombre de pages10
Numéro de publication9
Les DOIs
Etat de la publicationPublié - août 2010
Modification externeOui

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