Thermodynamic properties of organic compounds

Cingolani, Antonella; Berchiesi, G.

doi:10.1007/bf01911490

Cited by 58 publications

(26 citation statements)

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“…Examination of the fusion enthalpies reported in the literature for the diacids [6], reveals a number of transitions occurring in the solid phase. Since the method of purification of these materials differed from those used in the sublimation experiments, the possibility of polymorphism could not be ruled out.…”

Section: Resultsmentioning

confidence: 97%

“…The onset temperatures may also be affected by other solid-solid phase transitions occurring just prior to melting but not resolved by the calorimeter. It is not clear how the literature values were measured [6]. The last column in the table describes whether these transitions were observed after heating to T % 360 K for several hours, conditions used prior to measurement of the sublimation enthalpies of the odd alkanedioic acids [1].…”

Section: Resultsmentioning

confidence: 97%

“…Combined with the sublimation enthalpy of 1,4-cubanedicarboxylic acid, this would provide us with the enthalpy of formation of this compound in the gas phase, an important quantity in the evaluation of the strain energy by means of isodesmic reactions. The availability of sublimation enthalpies of the straight chain diacids and their fusion enthalpies [6] suggested a means of evaluating their vaporization enthalpies. The use of these vaporization enthalpies as standards could provide the vaporization enthalpy of 1,4-cubanedicarboxylic acid measured by correlation-gas chromatography.…”

Section: Introductionmentioning

confidence: 99%

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Vaporization, fusion and sublimation enthalpies of the dicarboxylic acids from C4 to C14 and C16

Roux

Temprado

Chickos

2005

The Journal of Chemical Thermodynamics

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Vaporization, fusion and sublimation enthalpies of the dicarboxylic acids from C4 to C14 and C16

Roux

Temprado

Chickos

2005

The Journal of Chemical Thermodynamics

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“…2, where the index 1 refers to the alcohol. ASto t and dHto t for component 2 are given in the literature [7,8].…”

Section: Resultsmentioning

confidence: 99%

The phase equilibria in some binary systems containing stearic alcohol

Lobbia

Berchiesi

1976

Journal of Thermal Analysis

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The liquid -liquid and liquid -solid equilibrium temperatures are taken for the binary systems octadecanol + A (A ----dicarboxylic acids, biphenyl or (K, Na) stearate). The results are discussed and a relation connecting the composition of the eutectics with the thermodynamic properties of fusion of the components is derived from the ideal equation and compared with the experimental one.In previous papers the liquid-liquid and liquid-solid equilibria of binary systems stearic acid + dicarboxylic acids [1 ] and dicarboxylic acids + monocarboxylic acids (from C1~ to C17) [2] were discussed.In order to understand the importance of the structure on the demixing phenomenon, the present note deals with the phase equilibria in the binary systems stearic alcohol + dicarboxylic acids.

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“…Dupr6 la Tour [1] reported an enantiotropic transformation at 77 ~ In the other case, Cingolani [5] detected a transition at 96 ~ The aim of this work was to clear up these inconsistent results by means of new solid-state analytical methods in polymorphism research and to establish an energy/temperature diagram to illustrate the thermodynamic relationships of the modifications.…”

Section: Dupr6 La Tour [-1] Kay [2] Raomentioning

confidence: 98%

On the polymorphism of dicarboxylic acids: I pimelic acid

1996

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Abstract.The results of solid-state analytical studies on pimelic acid demonstrate that the compound occurs in three polymorphic modifications. The modifications have been characterized by means of thermal analysis (videosupported thermomicroscopy, DSC, TGA), temperature-controlled FTIR microscopy and X-ray powder diffractometry, FT Raman and t3C NMR spectroscopy, as well as pycnometry. The thermodynamic relationships are illustrated in a semi-schematic energyjtemperature-diagram, which gives information about the relative stabilities and physical properties of the three modifications. Mod. III (commercial product, density 1.315 g cm -3) is the thermodynamically stable form between absolute zero and nearly 57 ~ (transition point with rood. II 55 to 59 ~ Mod. I! (density 1.276 g cm-3) is thermodynamically metastabte in ambient conditions, but resistant. The transition point of mod. II with I (m.p. 105 ~ was determined to be 97.0 to 97.6 ~ Key words: pimelic acid, thermal analysis, polymorphism, energy/temperaturediagram, alkanedioic acid. [-31 and Delarbre [41 presupposed as known that alkanedioic acids with an odd number of carbon atoms generally are polymorphic and appear in two crystalline forms: the high-temperature form ~ and the lowtemperature form 3. Dupr6 la Tour [-1], Kay [2], RaoTwo authors have described the thermal behaviour of pimelic acid (pentanedicarboxylic acid) and reported a dimorphic relationship. Dupr6 la Tour [1] reported an enantiotropic transformation at 77 ~ In the other case, Cingolani [5] detected a transition at 96 ~ The aim of this work was to clear up these inconsistent results by means of new solid-state analytical methods in polymorphism research and to establish an energy/temperature diagram to illustrate the thermodynamic relationships of the modifications.

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Thermodynamic properties of organic compounds

Cited by 58 publications

References 1 publication

Vaporization, fusion and sublimation enthalpies of the dicarboxylic acids from C4 to C14 and C16

Vaporization, fusion and sublimation enthalpies of the dicarboxylic acids from C4 to C14 and C16

The phase equilibria in some binary systems containing stearic alcohol

On the polymorphism of dicarboxylic acids: I pimelic acid

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