Confirmation of the hopping mechanism of the conductivity of bromide ions in solutions containing bromine

Rubinstein, Israel; Bixon, M.; Gileadi, E.

doi:10.1021/j100444a007

Cited by 43 publications

(32 citation statements)

References 13 publications

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“…As suggested in previous conductivity investigations of the Br − /Br 2 system the high conductivity is possibly due to a Grotthuss-type hopping mechanism [20]. This hopping mechanism is also expected for the present system [HMIM][Br 9 ] as shown in Eq.…”

Section: Conductivitysupporting

confidence: 86%

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

Haller

Hog

Scholz

et al. 2013

Zeitschrift Für Naturforschung B

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Section: Conductivitysupporting

confidence: 86%

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

Haller

Hog

Scholz

et al. 2013

Zeitschrift Für Naturforschung B

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“…This type of behavior is indicative of a non-Stokesian mechanism of conductivity involving the hopping of I-in the present case from an I3-to a neighboring I2 molecule. A similar mechanism of conductivity was observed by Gileadi et al (14)' for solutions of tetraalkylammonium bromide in liquid bromine. (ii) Concentration dependence: the change of molar conductivity .with concentration in the liquid is rather more complex, showing first a decrease and then an increase with concentration (2,11).…”

Section: Resultssupporting

confidence: 79%

Simultaneous Measurement of Differential Thermal Analysis and Electrolytic Conductivity in Iodide/Iodine Mixtures

Kirowa‐Eisner

Brestovisky

Reshef

et al. 1986

J. Electrochem. Soc.

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A computer-controlled experimental setup is described, which allows simultaneous determination of electrolytic conductivity and differential thermal analysis in several cells. The setup can be used to study the processes occurring during phase transitions in multicomponent systems. Electrolytic conductivity is measured by the four-electrode method, allowing the use of a large variety of electrode materials that may be needed for corrosive media, while ensuring high accuracy. Conductivity values can be measured in the range of 10-sS to 1S. The system developed operates between -50 ~ and + i30~ and measurements can be conducted in eight cells in parallel. Both the temperature range and the number of cells can be readily extended. A Pyrex glass cell, in which a solid-state thermometer is physically separated from, yet in good thermal contact with, the solution, was designed, to allow work in highly corrosive liquids. The scope and validity of the experimental setup is verified by measurements in solutions of iodide salts in iodine and of NaC1 in water. It is observed that, in the two-phase region between the melting point of the pure solvent and that of the eutectic mixture, the specific conductivity is relatively high and does not change much with temperature. It seems that, just above the melting point of the eutectic, a small amount of the concentrated solution wets the surface of the solid particles, forming a continuous path of conductivity through the liquid between the electrodes.The measurement of the electrolytic conductivity of aqueous solutions can be performed with very high precision. Determination of the specific conductivity of pure ice is more difficult, because of interference of surface conductivity, and special techniques are employed. Recently, there has been a renewed interest in the determination of the specific conductivity of aqueous solutions below the melting point (1). Consider, for example, a 0.10M solution of NaCI: in the range between the melting point (-0.36~ and the eutectic point (-21.3~ two phases exist, and the measured specific conductivity is a complex function of temperature and initial concentration and may depend on such factors as cell configuration and rate of cooling. Similar behavior is expected when the conductivity of dilute solutions of iodides in liquid iodine is measured.When the conductivity is studied over a range of temperatures, it is important to correlate changes in conductivity observed with phase transitions occurring in the system. In the present work, a computer-controlled experimental setup, in which conductivity and differential thermal analysis (DTA) measurements can be made simultaneously, is described. The cell was designed to operate with highly corrosive materials such as liquid iodine or bromine.Results obtained for solutions of RbI in I2 between 50" and 130~ are shown, to demonstrate the usefulness of the experimental setup. Some data for dilute aqueous solutions of NaC1 are also shown, for comparison. The data obtained can provide further insight i...

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“…6). In this case a solution of (C 2 H 5 ) 4 NBr (TEABr) in nitrobenzene (NB) was used, molecular bromine was added, and the conductivity was determined as a function of the concentration of bromine in the solvent mixture [21]. Although NB is a polar solvent, while Br 2 is nonpolar, the specific conductivity of the salt increases with the addition of Br 2 , indicating that an added mechanism of ionic conductivity must be playing a role.…”

Section: The Bromide/bromine Systemmentioning

confidence: 99%

Electrolytic conductivity—the hopping mechanism of the proton and beyond

Gileadi

Kirowa‐Eisner

2006

Electrochimica Acta

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Confirmation of the hopping mechanism of the conductivity of bromide ions in solutions containing bromine

Cited by 43 publications

References 13 publications

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

Simultaneous Measurement of Differential Thermal Analysis and Electrolytic Conductivity in Iodide/Iodine Mixtures

Electrolytic conductivity—the hopping mechanism of the proton and beyond

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Confirmation of the hopping mechanism of the conductivity of bromide ions in solutions containing bromine

Cited by 43 publications

References 13 publications

[HMIM][Br9]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

[HMIM][Br9]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

Simultaneous Measurement of Differential Thermal Analysis and Electrolytic Conductivity in Iodide/Iodine Mixtures

Electrolytic conductivity—the hopping mechanism of the proton and beyond

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[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion

[HMIM][Br₉]: a Room-temperature Ionic Liquid Based on a Polybromide Anion