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Title: ζ-Glycine: insight into the mechanism of a polymorphic phase transition

Journal Article · · IUCrJ
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4];  [5];  [1]; ORCiD logo [6]
  1. Harwell Science and Innovation Camus, Didcot (United Kingdom). Rutherford-Appleton Lab. ISIS Facility
  2. Harwell Science and Innovation Camus, Didcot (United Kingdom). Rutherford-Appleton Lab. ISIS Facility; Univ. of Edinburgh, Scotland (United Kingdom). School of Chemistry and Centre for Science at Extreme Conditions
  3. Scuola Internazionale Superiore di Studi Avanzati, Trieste (Italy)
  4. Univ. of Edinburgh, Scotland (United Kingdom). School of Chemistry and Centre for Science at Extreme Conditions
  5. Scuola Internazionale Superiore di Studi Avanzati, Trieste (Italy); Univ. of California, San Diego, CA (United States). Dept. of Chemistry and Biochemistry
  6. Harwell Science and Innovation Camus, Didcot (United Kingdom). Rutherford-Appleton Lab. ISIS Facility; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Glycine is the simplest and most polymorphic amino acid, with five phases having been structurally characterized at atmospheric or high pressure. A sixth form, the elusive ζ phase, was discovered over a decade ago as a short-lived intermediate which formed as the high-pressure ϵ phase transformed to the γ form on decompression. However, its structure has remained unsolved. We now report the structure of the ζ phase, which was trapped at 100 K enabling neutron powder diffraction data to be obtained. The structure was solved using the results of a crystal structure prediction procedure based on fullyab initioenergy calculations combined with a genetic algorithm for searching phase space. We show that the fate of ζ-glycine depends on its thermal history: although at room temperature it transforms back to the γ phase, warming the sample from 100 K to room temperature yielded β-glycine, the least stable of the known ambient-pressure polymorphs.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1625820
Journal Information:
IUCrJ, Vol. 4, Issue 5; ISSN 2052-2525
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Insights into the Crystallization and Structural Evolution of Glycine Dihydrate by In Situ Solid‐State NMR Spectroscopy journal May 2018
Structure prediction drives materials discovery journal April 2019
High-pressure polymorphism in l -threonine between ambient pressure and 22 GPa journal January 2019
Structural investigation and compression of a co-crystal of indomethacin and saccharin journal January 2019
Pressure-induced isosymmetric phase transition in biurea journal January 2019
Cohesive properties of the crystalline phases of twenty proteinogenic α-aminoacids from first-principles calculations journal January 2019
Intermolecular Interactions in Functional Crystalline Materials: From Data to Knowledge journal September 2019
Insights into the Crystallization and Structural Evolution of Glycine Dihydrate by In Situ Solid‐State NMR Spectroscopy journal May 2018
Structure Prediction Drives Materials Discovery text January 2019


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