Conductance of s-Acetylthiocholine Chlorides in Non-Aqueous Solvents at 25 ºC

El-Hammamy, N. H.; El-Hammamy, M. N.; El‐Mallah, Nabila M.; Kawana, Aida I.; Moharem, Heba M.

doi:10.14233/ajchem.2013.14088

Cited by 3 publications

(3 citation statements)

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“…El-Hammamy et al [2][3][4][5][6]8 , measured the conductances of Sacetylthiocholine halides and perchlorate in methanol, ethanol, n-prpanol, n-butanol, 2-propanol and acetonitrile solutions at 25 ºC. They found that the same trends of solvation (aº) for all organic solvents are in agreement with the present results.…”

Section: Resultssupporting

confidence: 86%

Electrical Conductivity of S-Acetylthiocholine Halides and Perchlorate in Ethanol at 40 ºC

El-Hammamy¹,

El-Kashlan²,

Moharem³

2013

Asian J. Chem.

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The conductance of S-acetylthiocholine halides and perchlorate has been measured in ethanol at 40 ºC. The data were analyzed using the Fuoss-Onsager equation for 1:1 associated electrolytes and the characteristic functions, Λº (conductance at infinite dilution), a 0 (contact distance) and KA (association constant) were computed. KA values were analyzed on the basis of the solvent separated-ion pair model.

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Section: Resultssupporting

confidence: 86%

Electrical Conductivity of S-Acetylthiocholine Halides and Perchlorate in Ethanol at 40 ºC

El-Hammamy¹,

El-Kashlan²,

Moharem³

2013

Asian J. Chem.

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“…The cell constant was 0.1 cm -1 for dilute solutions. The solvent constants used in all calculations were taken as reported [10][11][12][13] , i.e., densities (d25º) = 0.7762 g cm -3 , (d30º) = 0.7712 g cm -3 , (d35º) = 0.7652 g cm -3 , (d40º) = 0.7492 g cm -3 , respectively, the viscosities (η25º) = 0.3412 × 10 -2 P, (η30º) = 0.3270 × 10 -2 P and (η35º) = 0.31309 × 10 -2 P, (η40º) = 0.2995 × 10 -2 P, respectively and the dielectric constants (D25º) = 36.61, (D30º) = 35.97, (D35º) = 35.36, (D40º) = 34.74, respectively.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamics of Ion Association of s-Acetylthiocholine Halides and Perchlorate in Acetonitrile

El-Hammamy¹,

El-Hammamy²,

El‐Mallah³

et al. 2013

Asian J. Chem.

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Thermodynamic parameters (∆Hº, ∆Gº, ∆Sº) and the activation energy (∆Es) were calculated to explain the limiting equivalent conductance (Λ0) and ion association constant (KA) of s-acetylthiocholine halides and perchlorate in acetonitrile at different temperatures by using conductance measurements. It has been evaluated by using Fuoss-Onsager equation. It is evident that the values of (Λ0) increase regularly with increase in temperature. For all salts of s-acetylthiocholine, (Λ0) indicates less solvation or higher mobility of the ions in all solvent systems studied. The free energy change ∆Gº values are negative for all salts (Br -, Iand ClO4 -). Clearly strengthening to interionic association at higher temperatures is largely caused by a decrease in the permitivity of the solvent. The positive values of (∆Hº) for three salts (Br -, Iand ClO4 -) show that the association processes are endothermic in nature. Entropy change (∆Sº) values are positive for all salts indicate the randomness of ions in all solvent systems studied.

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“…El-Hammamy et al [9], have applied Zwanzig theory of dielectric friction for chloride ion in different solvents at 25 o C. They compared the values of radius (ri) obtained from the slope and that one obtained from the intercept of the straight line for  Cl and it was found that the radius from both of slope and intercept slightly decreases with increasing the ionic size from  Cl to  I . This may be attributed to the decrease in solvation.…”

Section: Resultsmentioning

confidence: 99%