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  • 18-crown-6-ether  (1)
  • Gurney cosphere  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A conductance investigation of HCl in aqueous solutions of tetrahydrofuran, dimethoxyethane and dioxane (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 1211-1224 
    Details
    ISSN: 1572-8927
    Keywords: Hydrochloric acid ; water-tetrahydrofuran ; water-dioxane ; water-dimethoxyethane ; conductance ; association constants ; proton mobility ; Gurney cosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Conductance of dilute solutions of HCl in water-tetrahydrofuran (THF), water-dioxane and water-dimethoxyethane (DME) were measured and the data processed using the Justice-Ebeling equation to evaluate the limiting conductance ΛO, the association constant KA and the apparent distance of closest approach a'. The Friedman-Rasaiah Gurney cosphere overlap term d+−/kT was calculated from a' values and illustrates the different solvation pattern of dioxane compared to that found for THF and DME. It would appear that dioxane can solvate cations more strongly due to its ability to form a boat configuration around a cation. The association constants are reasonably reproduced by the Bjerrum equation using realistic molecular dimensions of the ions involved for the distance of closest approach. The limiting conductance in the mixtures illustrates clearly the different mechanism for proton conductance compared to that for the cesium ion. The dielectric constants, viscosities and densities of the solvent mixtures were measured and are reported. The lowest dielectric constant for each type of solvent mixture was about 10.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652546
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Apparent molar volumes of crown ether complexes in several solvents at 25°C. An estimation of ionic electrostriction (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 1001-1016 
    Details
    ISSN: 1572-8927
    Keywords: 18-crown-6-ether ; dibenzo-18-crown-6-ether ; apparent molar volume ; partial molar volume change on complex formation ; methanol ; acetonitrile ; dimethylsulfoxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The apparent molar volumes of equimolar concentrations of 18-crown-6-ether (CE) or dibenzo-18-crown-6-ether (B2CE) and MCl (M=Na, K, or Cs) or MI in dilute solutions of anhydrous methanol, acetonitrile and dimethylsulfoxide have been calculated from density data measured at 25°C. After extrapolation to infinite dilution these results together with the apparent molar volumes of the crown ethers and the alkali metal halides were used to calculate the limiting partial molar volume change for the formation of the complexes. By noting that the charge of the complexed cation has been shown to be completely shielded from the solvent, the volume of complexation can be assumed to be a good estimation of the volume change due to electrostriction of the solvent by the cationic charge. The results are compared to the predictions of the Hepler equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663999
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    Paper (German National Licenses)
    Fulltext
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