Partial molal volumes of amines in benzene. Specific interactions

Barbosa, Ester F.G.; Lampreia, Isabel M.S.

doi:10.1139/v86-062

Cited by 29 publications

(29 citation statements)

References 11 publications

(23 reference statements)

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“…36. "Estimated value from a linear regression of V' vs. n, with 11, varying from 9 to 30. electrons of this group and the delocalized electrons in benzene (18,23,24) seem to vary regularly along the series. Thus in (iii) Spectral studies of temperature variation and solvents effects order to evaluate this term more correctly we added to the Figure shows the Raman spectrum of liquid tri-n-butylvan der Waals volume of the tertiary amine group a term amine at room temperature.…”

Section: Resultsmentioning

confidence: 94%

“…Calculated and experimental partial molal volumes (v0/cm3 mol-') for afew tri-n-alkylamines in benzene, at 298 K Molecule Tri-n-ethylamine Tri-n-propylamine Tri-n-butylamine Tri-n-hexy lamine Tri-n-octylamine Tri-n-decylamine Tri-n-dodecylamine "From ref. 18. bFrom ref.…”

Section: Resultsmentioning

confidence: 99%

“…Even so, the samples were dried and distilled by repeated fractional distillation as previously described (18), before recording the spectra and taking density measurements. Partial molal volumes were obtained from the densities of solutions.…”

Section: Methodsmentioning

confidence: 99%

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The temperature dependence of the Raman spectrum and gauche interactions of tri-N-butylamine: a conformational study

Costa¹,

Carvalho²,

Teixeira‐Dias³

et al. 1987

Can. J. Chem.

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M. S. LAMPREIA. Can. J . Chem. 65, 384 (1987).Raman spectra of tri-n-butylamine show pairs of bands whose temperature-dependent intensities clearly suggest their assignment to different conformers in simultaneous equilibria. These spectroscopic data are interpreted and correlated with structural information obtained from statistical analysis of gauche skeletal arrangements in tri-n-butylamine. The average numbers of gauche interactions in various tri-n-alkylamines are used to evaluate partial molal volumes which show excellent agreement with experimental data, thus imparting statistical meaning and usefulness to the concept of "average conformation".As the temperature decreases, the band at 904 cm-' in pure liquid tri-n-butylamine increases in intensity at the expense of the band at 880 cm-I. Both of these bands are ascribed to CH2 and CH3 rocking vibrations. In solution, the conformer represented by the band at 904 cm-' is favoured by polar solvents, whereas the conformer represented by the 860 cm-I band is favoured by non-polar solvents.The relative intensity changes with increasing temperature of the bands at 1456 and 1440 cm-is explained by an increase in the number of CH2 groups adjoining two gauche bonds and a decrease in the number of CH2 groups adjoining a trans and gauche bond.Temperature dependence of the relative intensities of bands in the CH stretching region suggest, by comparison with mono-and di-n-butylamine, that the increase in the number of alkyl chains around the nitrogen atom makes molecular packing less restrictive and unique, giving rise to mesophases, as the overall shapes of the molecules become more spherical. Chem. 65, 384 (1987).Les spectres Raman de la tri-n-butylamine prksentent des paires de bandes dont les intensitts dependent de la temperature; ces observations suggkrent clairement que l'on doit les attribuer a differents conformkres dans Cquilibres simultanks. O n interprkte ces donnCes spectroscopiques et on Ctablit une correlation avec les informations stmcturales obtenues a partir d'une analyse statistique des arrangements gauches du squelette de la tri-n-butylamine. On utilise les nombres moyens d'interactions gauches dans diverses tri-n-alkylamines pour Cvaluer les volumes molales partiels qui sont en bon accord avec Ies donnees expCrimentales; cette correlation permet d'attribuer une signification statistique et de dimontrer l'utilitk du concept de ccconformation moyenne n.Dans le cas de la tri-n-butylamine a 1'Ctat de liquide pur, une diminution de la temperature provoque une augmentation de l'intensitk de la bande A 904 cm-I, au detriment de la bande a 880 cm-I. On attribue ces deux bandes aux vibrations de balancement des CH2 et CH3. En solution, le conformere represent6 par la bande a 904 cm-I est favoris6 dans les solvants polaires alors que le conformkre represent6 par la bande a 860 cm-I est favoris6 par les solvants non polaires.On explique les changements d'intensitks relatives des bandes a 1456 et 1440 cm-', qui sont associCs a une augmentation de la tempCrature,...

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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The temperature dependence of the Raman spectrum and gauche interactions of tri-N-butylamine: a conformational study

Costa¹,

Carvalho²,

Teixeira‐Dias³

et al. 1987

Can. J. Chem.

Self Cite

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“…Binary mixtures of benzene with tert-alkylamines are expected to reveal many interesting properties because of the possible existence of specific interactions between the mixing components [4].…”

Section: Introductionmentioning

confidence: 99%

“…A literature survey indicates that studies on molecular interactions in binary mixtures of amines with benzene [4], 2-methoxyethanol [6], alkanes [7], alcohols [8], linear and branched alkanes [9], and with chloroform [10] have been reported using volumetric and calorimetric methods at single, or at the most, three different temperatures. To the best of our knowledge, there are no literature data on binary mixtures of benzene with TEA and TBA for volumetric and refractive index measurements over a relatively wide range of temperature (278.…”

Section: Introductionmentioning

confidence: 99%

Densities and Refractive Indices of Binary Mixtures of Benzene with Triethylamine and Tributylamine at Different Temperatures

et al. 2006

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Experimental densities, ρ, and refractive indices, n D for binary liquid mixtures of benzene with triethylamine (TEA) and tributylamine (TBA) have been measured as a function of composition in the temperature range from 278.15 to 318.15 K. The excess molar volume, V E , and its temperature dependence, dV E /dT for the binary mixtures were calculated using the experimental data. The values of V E for the mixtures were also estimated by using the Flory statistical theory and refractive index.

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Volumetric Properties of Difurylmethane in Methanol from 288.15 to 308.15 K

Mokate

Ddamba

2005

J Solution Chem

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Partial molal volumes of amines in benzene. Specific interactions

Cited by 29 publications

References 11 publications

The temperature dependence of the Raman spectrum and gauche interactions of tri-N-butylamine: a conformational study

The temperature dependence of the Raman spectrum and gauche interactions of tri-N-butylamine: a conformational study

Densities and Refractive Indices of Binary Mixtures of Benzene with Triethylamine and Tributylamine at Different Temperatures

Volumetric Properties of Difurylmethane in Methanol from 288.15 to 308.15 K

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