SOLVENTS HAVING HIGH DIELECTRIC CONSTANTS. XIII. CONDUCTANCES OF MULTIVALENT ELECTROLYTES IN N-METHYLACETAMIDE AT 40°<sup>1,2</sup>

Dawson, Lyle R.; Vaughn, Joe W.; Lester, George R.; Pruitt, M. E.; Sears, Paul G.

doi:10.1021/j100796a014

Cited by 18 publications

(5 citation statements)

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“…The spectra agreed well with those in the literature (19,26). A Model 4666 Leeds and Northrup Dyke-Jones conductivity bridge unit, described in detail elsewhere (11), in conjunction with a Freas-type conductance cell (12) was used to measure the specific conductivities of TEU, DMEU, and DMPU. Capacitance measurements were obtained at 1 MHz using a Twin-T impedence bridge assembly, described in detail elsewhere (6), in conjunction with two glass cells having parallel plate electrodes of different geometries (6,18).…”

Section: Methodssupporting

confidence: 77%

“…Another distillation, over BaO at 65 °C (2 mm Hg), provided a colorless liquid in contrast to the yellow appearance of the crude distillate. Successive fractional freezings (11) then gave a very pure product with a specific conductance ranging from 1-7 X 10-8 ohm-1 cm-1. The liquid range for DMEU was determined as 8.2-220 °C (~754 mm Hg).…”

Section: Methodsmentioning

confidence: 99%

“…Drying was completed by refluxing over calcium hydride, followed by fractionation and degassing as described for acetonitrile, except that a 2-ft column with glass packing was used for fractionation. This permitted distillation to be carried out in a fume hood, as the higher nitriles are noticeably toxic (11).…”

Section: Methodsmentioning

confidence: 99%

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Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Rosenfarb¹,

Huffman²,

Caruso³

1976

J. Chem. Eng. Data

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Dielectric constants, viscosities, densities, and refractive indices of three urea derivatives were measured at various temperatures ranging from 25 to 100 °C. The experimental data as functions of temperature were fitted precisely to appropriate equations. Dielectric constant data indicated a significant increase in dielectric constant of the cyclic ureas over that of the acyclic homologs. Kirkwood correlation factors and the activation energies of viscous flow were also evaluated. Values for Kirkwood correlation factors ranged from 1.07 to 1.21. This range indicates but does not substantiate parallel dipole association. Activation energies ranged from 3.3 to 4.4 kcal/mol.

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Section: Methodssupporting

confidence: 77%

Section: Methodsmentioning

confidence: 99%

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Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Rosenfarb¹,

Huffman²,

Caruso³

1976

J. Chem. Eng. Data

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“…OINCE the classical work of de Visser (2) in 1898, solidliquid phase diagrams have been published for binary systems involving various long-chain fatty acid combinations (6). Those systems involving two homologous saturated acids exhibit molecular compound formation.…”

Section: Resultsmentioning

confidence: 99%

“…Using the method of Wenker (24), N2HEA was prepared by heating an equimolar mixture of monoethanolamine and glacial acetic acid in a distillation apparatus until the stoichiometric volume of by-product water was collected. The resulting N2HEA was purified by a method of fractional freezing (6). Several freezing cycles were required before a product having a constant maximum freezing point of about 32°C.…”

Section: Methodsmentioning

confidence: 99%

Dielectric constants and viscosities of some mono-N-substituted amides and cyclic esters

Sears¹,

O'Brien²

1968

J. Chem. Eng. Data

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Dielectric constants, densities, and viscosities of four mono-N-substituted amides of acetic and formic acids and two sulfur-containing cyclic esters have been determined at several temperatures in the 25°to 75°C. range. Computer methods have been used to obtain least squares fitting of the experimental data to appropriate equations. Five of the six liquids have dielectric constants which are greater than that of water at a comparable temperature. The dielectric constants of the liquids are discussed with respect to structure and compared with those of closely related species. Activation energies of viscous flow have been calculated using a differentiated form of the Girifalco equation.

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Leitfähigkeit von Elektrolytlösungen

Barthel

1968

Angewandte Chemie

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In der vorliegenden Arbeit werden Methoden und Ergebnisse der Leitfahigkeitsuntersuchungen rnit besonderer Berucksichtigung nichtwcisseriger Losungsmittel diskutiert, z . 6. Athanol, Dioxan, Dimethylformamid, Acetonitril, Nitromethan und Aceton, zum Teil in Mischungen rnit Wasser, sowie NH3, S02, 52 u.a. Anhand eines Modells, das Ionen als ladungstragende Kugeln und das Losungsmittel als homogenes isotropes Medium darstellt, vermag die Leitfahigkeitstheoriezumindest fur niedrige Elektrolytkonzentrationen --eine geschlossene Darstellung des Problems zu geben. Eine neue statistische Behandlung des Transportproblems bestiitigt wesentliche Ergebnisse dieser Darstellung. Eine abschlieJende ubersicht uber die neueren Veriiffentlichungen sol1 den derreitigen Stand der Untersuchungen umgrenzen. Na++ CI-Die ionenerzeugende Reaktion der potentiellen Elektrolyte mit dem Losungsmittel verlauft unvollstandig.CH$OOH+ HzO + CH3COO-+ H3O+ Beide Prozesse werden durch thermodynamische Gleichgewichtskonstanten KA (Assoziationskonstante) oder KD (Dissoziationskonstante) beschrieben [**I. [**I In der folgenden Liste sind die venvendeten Zeichen in der ungefllhren Reihenfolge ihres Auftretens zusammengestellt. = Assoziationskonstante [I/mol] = Dissoziationskonstante [mol/l] = molare Leitfahigkeit m -1 cm2 mol-I] = ,kquivalentleithhigkeit m -1 cm2 val-11 = Grenzwert der Leitfahigkeit fur c +O = spezifische Leitfllhigkeit [&I cm-l] = spezifische Leithhigkeit des Losungsmittels = elektrochemische Wertigkeit des Elektrolyten [K::A:I]; ne = v+z+ = Y-'z-, (Fortsetzung der FuBnote siehe S. 254.)

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SOLVENTS HAVING HIGH DIELECTRIC CONSTANTS. XIII. CONDUCTANCES OF MULTIVALENT ELECTROLYTES IN N-METHYLACETAMIDE AT 40°^1,2

Cited by 18 publications

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Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Dielectric constants and viscosities of some mono-N-substituted amides and cyclic esters

Leitfähigkeit von Elektrolytlösungen

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SOLVENTS HAVING HIGH DIELECTRIC CONSTANTS. XIII. CONDUCTANCES OF MULTIVALENT ELECTROLYTES IN N-METHYLACETAMIDE AT 40°1,2

Cited by 18 publications

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Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

Dielectric constants and viscosities of some mono-N-substituted amides and cyclic esters

Leitfähigkeit von Elektrolytlösungen

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SOLVENTS HAVING HIGH DIELECTRIC CONSTANTS. XIII. CONDUCTANCES OF MULTIVALENT ELECTROLYTES IN N-METHYLACETAMIDE AT 40°^1,2