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  • 1
    Electronic Resource
    Electronic Resource
    A thermodynamic study of the association of alkali metal cations with dicyclohexano-18-crown-6 (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 555-564 
    Details
    ISSN: 1573-1111
    Keywords: Dicyclohexano-18-crown-6 ; alkali cations ; thermodynamic study ; crown ethers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A thermodynamic study of the association of Na+, K+, Rb+, and Cs+ with dicyclohexano-18-crown-6 in acetonitrile has been carried out at 308, 303, 298, 293, and 288 K using a conductometric technique. The observed molar conductivities, A, were found to decrease significantly for mole ratios less than unity. A model involving 1∶1 stoichiometry has been used to analyze the conductivity data. The stability constant,K, and the limiting molar conductivity, A c , for each 1∶1 complex were determined from the conductivity data by using a nonlinear least squares curve fitting procedure. The binding sequence, based on the value of logK at 298 K, as derived from this study is K+〉Na+〉Rb+〉Cs+. Values of ΔH o and ΔS o are reported and their significance is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656336
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A conductance study of the binding of benzo-15-crown-5 with alkali cations in acetonitrile (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 583-591 
    Details
    ISSN: 1573-1111
    Keywords: Benzo-15-crown-5 ; alkali cations ; electrolytic conductance ; crown ethers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decrease in the molar electrolytic conductance of Na+, K+, Rb+, and Cs+ tetraphenylborates, caused by the addition of benzo-15-crown-5 in acetonitrile at constant ionic strength, is analyzed according to a model involving 1:1 stoichiometry. The stability constant,K, and the limiting molar conductivity, Λ c , for each 1:1 complex are determined from the conductance measurements by using a nonlinear least squares curve fitting procedure. The stability sequence of the 1:1 complexes, as deduced from data at 288, 293, 298, 303, and 308 K, has the order Na+〉K+〉Rb+〉Cs+. Values of ΔH 0, ΔS 0, and Λ c at 298 K are reported and their significance is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656339
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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