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  • 1
    Electronic Resource
    Electronic Resource
    The complexation of alkaline cations by crown ethers and cryptands in acetone (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 569-577 
    Details
    ISSN: 1572-8927
    Keywords: Acetone ; crown ethers ; cryptands ; complex formation ; ion pairs ; alkali metal ions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Stability constants and thermodynamic values for the complex formation of alkali ions by crown ethers, diaza crown ethers and cryptands have been measured by means of potentiometric and calorimetric titrations in acetone as solvent. The interactions between the ligands and solvent molecules play an important role for the complex formation. Cryptands form the most stable complexes with alkali ions if inclusion complexes are formed. Even in the case that the salts are not completely dissociated in acetone the presence of ion pairs does not influence the calculated values of the stability constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972745
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  • 2
    Electronic Resource
    Electronic Resource
    Complex Formation Between Crown Ethers and Urea and Some Guanidinium Derivatives in Methanol (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 487-491 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry ; complex formation ; crown ethers ; guanidinium derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complexation of urea and some guanidinium derivatives by the ligands 15-crown-5, 18-crown-6, benzo-18-crown-6 and diaza-18-crown-6 in methanol has been studied by means of calorimetric titrations. The complex formation is mainly favored by entropic contributions. The number of solvent molecules released during the complex formation is responsible for the stability of the complexes formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010120108944
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  • 3
    Electronic Resource
    Electronic Resource
    The Interpretation of Thermodynamic Data for the Complex Formation of Cations with Crown Ethers and Cryptands. Part I: The Reaction Entropy (2000)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 38 (2000), S. 85-97 
    Details
    ISSN: 1573-1111
    Keywords: crown ethers ; cryptands ; complex formation ; reaction entropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complex formation between cationsand crown ethers or cryptands is influenced byenthalpic and entropic contributions. The solvation ofcations and ligands plays an important role andinfluences both thermodynamic parameters. Changes insolvation and their influence upon the reactionentropy is discussed in detail for some selectedreactions in different solvents. Other contributionse.g., from the deformation of the ligands areeliminated. Thus, the results obtained are valid forall complexation reactions between cations andmacrocyclic and macrobicyclic ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008136403647
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