期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 117, 期 23, 页码 12136-12145出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp401547f
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资金
- EPSRC
- BBSRC
- University of Warwick
- Birmingham Science City Advanced Materials Project 1
- Birmingham Science City Advanced Materials Project 2
- Advantage West Midlands (AWM)
- European Regional Development Fund (ERDF)
- Cardiff University
- Engineering and Physical Sciences Research Council [EP/F017901/1] Funding Source: researchfish
- EPSRC [EP/F017901/1] Funding Source: UKRI
To date, only one crystal structure of L-phenylalanine has been reported, with no confirmed report of polymorphism of this material. In the present work, we report the discovery of a new polymorph of L-phenylalanine, with the structural properties determined directly from powder X-ray diffraction data. The new polymorph of L-phenylalanine is stable only under rigorously dry conditions. In addition, two new solid hydrate phases of L-phenylalanine have been discovered: a monohydrate and a hemihydrate. The hemihydrate is susceptible to partial water deficiency. The crystal structures of the monohydrate and hemihydrate phases have also been determined directly from powder X-ray diffraction data. On the basis of results from dynamic vapor sorption and other experiments, we demonstrate that the three new solid forms are readily interconvertible as a function of relative humidity.
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