Excess viscosity .eta.E, excess volume VE, and excess free energy of activation .DELTA.G*E at 283, 293, 303, 313, and 323 K for mixtures acetonitrile and alkyl benzoates

1988 ◽  
Vol 33 (2) ◽  
pp. 200-204 ◽  
Author(s):  
Begona Garcia ◽  
Juan C. Ortega
Keyword(s):  
Free Energy ◽  
Excess Volume ◽  
Excess Free Energy ◽  
Energy Of Activation ◽  
Excess Viscosity ◽  
Free Energy Of Activation

Viscosities, Densities, and Refractive Indices of Binary Liquid Mixtures

1971 ◽  
Vol 49 (15) ◽  
pp. 2605-2609 ◽  
Author(s):  
Miguel Katz ◽  
Pedro W. Lobo ◽  
A. Sancho Miñano ◽  
Horacio Sólimo
Keyword(s):  
Free Energy ◽  
Hydrogen Bonds ◽  
Excess Volume ◽  
Liquid Mixtures ◽  
Refractive Indices ◽  
Dispersion Forces ◽  
Molar Free Energy ◽  
Excess Viscosity ◽  
Binary Liquid ◽  
Free Energy Of Activation

The viscosities, densities, and refractive indices at 25, 30, 35, and 40 °C were determined for the systems: aniline + toluene (A + T), N,N-dimethylaniline + toluene (DMA + T), and aniline + n-butanol (A + B). From the experimental results the excess volume, excess viscosity, and excess molar free energy of activation of flow were calculated. The deviations from ideality for the excess thermo dynamic functions are more important for the systems (A + T) and (A + B) than for (DMA + T). This fact is explained by the existence of dispersion forces in the mixture and by the presence of hydrogen bonds in pure aniline and pure butanol.

scholarly journals Excess volume and viscosity of binary liquid acid–base mixtures

1976 ◽  
Vol 54 (20) ◽  
pp. 3125-3129 ◽  
Author(s):  
Horacio N. Sólimo ◽  
Roque Riggio ◽  
José A. Espíndola ◽  
Silvia del V. Alonso ◽  
Miguel Katz
Keyword(s):  
Free Energy ◽  
Excess Volume ◽  
Refractive Indices ◽  
Molar Free Energy ◽  
Acid Base ◽  
Excess Viscosity ◽  
Liquid Acid ◽  
Binary Liquid ◽  
Excess Partial Molar Volume ◽  
Free Energy Of Activation

Densities, viscosities, and refractive indices at 25 °C were determined for the systems: o chlorophenol + N,N-dimethylaniline, o-chlorophenol + aniline, o-chlorophenol + m-toluidine, and o-chlorophenol + pyridine. From the experimental results the excess volume, excess viscosity, excess molar free energy of activation of flow, and the excess partial molar volume were calculated. There is evidence of complex formation between o-chlorophenol and the four bases.

Viscosity of Dimethyl Sulfoxide + 1,4 Dimethylbenzene System

2008 ◽  
Vol 59 (1) ◽  
pp. 45-48
Author(s):  
Oana Ciocirlan ◽  
Olga Iulian
Keyword(s):  
Free Energy ◽  
Dimethyl Sulfoxide ◽  
Atmospheric Pressure ◽  
Entire Range ◽  
Polynomial Equation ◽  
Energy Of Activation ◽  
Excess Gibbs Free Energy ◽  
Experimental Measurements ◽  
Gibbs Energy Of Activation ◽  
Free Energy Of Activation

This paper reports the viscosities measurements for the binary system dimethyl sulfoxide + 1,4-dimethylbenzene over the entire range of mole fraction at 298.15, 303.15, 313.15 and 323.15 K and atmospheric pressure. The experimental viscosities were correlated with the equations of Grunberg-Nissan, Katti-Chaudhri, Hind, Soliman and McAllister; the adjustable binary parameters have been obtained. The excess Gibbs energy of activation of viscous flow (G*E) has been calculated from the experimental measurements and the results were fitted to Redlich-Kister polynomial equation. The obtained negative excess Gibbs free energy of activation and negative Grunberg-Nissan interaction parameter are discussed in structural and interactional terms.

The crystal structure of ethyl-Z-3-amino-2-benzoyl-2-butenoate and measurement of the barrier to E,Z-isomerization

1980 ◽  
Vol 58 (17) ◽  
pp. 1821-1828 ◽  
Author(s):  
Gary D. Fallon ◽  
Bryan M. Gatehouse ◽  
Allan Pring ◽  
Ian D. Rae ◽  
Josephine A. Weigold
Keyword(s):  
Crystal Structure ◽  
Nuclear Magnetic Resonance ◽  
Hydrogen Bond ◽  
Free Energy ◽  
Magnetic Resonance ◽  
Energy Of Activation ◽  
X Ray ◽  
X Ray Crystallography ◽  
Free Energy Of Activation ◽  
Nuclear Magnetic

Ethyl-3-amino-2-benzoyl-2-butenoate crystallizes from pentane as either the E (mp 82–84 °C) or the Z-isomer (mp 95.5–96.5 °C). The E isomer is less stable, and changes spontaneously into the Z, which bas been identified by X-ray crystallography. The structure is characterised by an N–H/ester CO hydrogen bond and a very long C2—C3 bond (1.39 Å). Nuclear magnetic resonance methods have been used to measure the rate of [Formula: see text] isomerization at several temperatures, leading to the estimate that the free energy of activation at 268 K is 56 ± 8 kJ.

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