The formation of the plastic crystal phase in several pentaerythritol derivatives

Doshi, N.M.; Furman, Marina A.; Rudman, Reuben

doi:10.1107/s0567740873002104

Cited by 37 publications

(15 citation statements)

References 4 publications

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“…These values are of the same order of magnitude as those found for several similar compounds [13]. Results obtained at a fixed heating rate of 2 • C/min showed improved resolution by decreasing the mass 8.5, 4.0, 2.0 and 0.7 mg.…”

Section: Thermal Datasupporting

confidence: 82%

Solid-Solid Phase Transition in Trimethylolpropane (TRMP)

Chandra¹,

Mandalia²,

Chien³

et al. 2002

Zeitschrift Für Physikalische Chemie

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An orientationally disordered crystalline (ODIC) plastic phase (γ) was observed in Trimethylolpropane (TRMP) during heating by high resolution thermal and X-ray diffraction analyses. TRMP is a potential thermal energy storage material. The enthalpies of solid-solid (α → γ at 327.8 K) and fusion (γ → liquid at 332.7 K) transitions are 16.36 kJ/mol and 0.9 kJ/mol, respectively. Supercooling was observed during solidification of melts, and this supercooled γ phase began to transform to a metastable crystalline phase, designated as α , after 20 minutes at room temperature. The lattice parameters of the monoclinic α phase, obtained from this study, are: a = 0.8427(5), b = 0.9580(5), c = 0.9185(6) nm, β = 98.958(3) • @ 298 K with Z = 4. The ODIC high temperature FCC γ phase has a lattice parameter: a = 0.9274(3) nm @ 328 K with Z = 4. Differential scanning calorimetry, in-situ Bragg-Brentano X-ray diffractometry, and high temperature and resolution Guinier X-ray diffraction systems were used to determine these phase transitions.

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Section: Thermal Datasupporting

confidence: 82%

Solid-Solid Phase Transition in Trimethylolpropane (TRMP)

Chandra¹,

Mandalia²,

Chien³

et al. 2002

Zeitschrift Für Physikalische Chemie

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“…At room temperature, only one polymorphic form of tris has been observed though it is known to undergo reversible solid-solid transformation at~136°C (33). Thus the XRD results support our earlier conclusion, based on IR spectroscopy, of IMC tris salt formation.…”

Section: X-ray Diffractometrysupporting

confidence: 81%

Salt formation during freeze-drying - an approach to enhance indomethacin dissolution

Thakral

Suryanarayanan

2015

Pharm Res

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“…The high temperature orientationally disordered form, which is stable between 356.6$1.0 K and the melting point (473.7$1.0 K), has face-centered cubic symmetry with Z"4 (denoted as C $ ) with a lattice parameter of 8.876 (8) A s at 363 K (20,21).…”

Section: Pg [(Ch )C(ch Oh) ]mentioning

confidence: 99%