Polymorphism, phase transitions, and thermal stability of L-Pyroglutamic acid
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F10%3A00438343" target="_blank" >RIV/68378271:_____/10:00438343 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/cg100260f" target="_blank" >http://dx.doi.org/10.1021/cg100260f</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/cg100260f" target="_blank" >10.1021/cg100260f</a>
Alternative languages
Result language
angličtina
Original language name
Polymorphism, phase transitions, and thermal stability of L-Pyroglutamic acid
Original language description
L-Pyroglutamic acid undergoes a phase transition, alpha-->beta, at similar to 68 degrees C on heating, which is reversible with hysteresis depending on the cooling rate, before melting at similar to 162 degrees C. On cooling, a further reversible transition, alpha-->alpha', which shows martensitic characteristics, occurs at similar to -140 degrees C. The structural changes at the transitions were studied by variable temperature X-ray powder diffraction and Raman spectroscopy and compared with reports ofsingle crystal structure determinations. Differences in Raman spectra were attributed to differences in intermolecular N-H center dot center dot center dot O interactions in the three enantiotropic polymorphs. By optical microscopy, crystals frequentlyjumped around the microscope slide on passing through the alpha/beta transition; this is attributed to discontinuous changes in the unit cell dimensions leading to a spring effect in the crystals.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
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Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2010
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Crystal Growth & Design
ISSN
1528-7483
e-ISSN
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Volume of the periodical
10
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
3141-3148
UT code for WoS article
000279422700045
EID of the result in the Scopus database
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