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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

  • Czech description

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

Result continuities

  • Project

  • 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

  • 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