Matches in SemOpenAlex for { <https://semopenalex.org/work/W2069622017> ?p ?o ?g. }
- W2069622017 abstract "Pressure-induced transformation of $ensuremath{gamma}$-IMC [1-($p$-chlorobenzoyl)-5-methoxy-2-methylindole-3-acetic acid] is analyzed from Raman scattering investigations in the low-frequency range of $10--250phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$ and the high frequency region between 1550 and $1750phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, where $mathrm{C}mathrm{O}$ stretching vibrations are usually observed. At room temperature, by pressurization from atmospheric pressure up to $4phantom{rule{0.3em}{0ex}}mathrm{GPa}$, $ensuremath{gamma}$-IMC undergoes a collapse transformation into a high-pressure crystalline form, induced by large rearrangement in the hydrogen-bonded network associated with molecular conformational changes. The Raman spectrum of the high-pressure crystal is similar to that of the $ensuremath{alpha}$ form, which is denser than the $ensuremath{gamma}$ form and metastable with respect to $ensuremath{gamma}$-IMC at atmospheric pressure. Upon further compression a solid-state amorphization is observed via the breakdown of hydrogen bonds. The Raman line shape of the high-pressure amorphous form is different from that of the vitreous state (or thermal glass obtained by quenching the liquid), suggesting the existence of a high-density amorphous state. By release of pressure, this high-density amorphous state transforms into the thermal glass. This transformation can be interpreted as a transformation between a high-density amorphous to a low-density amorphous state, which could be associated with a polyamorphic transformation." @default.
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- W2069622017 date "2008-03-28" @default.
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- W2069622017 title "Evidence for a high-density amorphous form in indomethacin from Raman scattering investigations" @default.
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- W2069622017 doi "https://doi.org/10.1103/physrevb.77.094205" @default.
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