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  • 1
    Electronic Resource
    Electronic Resource
    Complexation of Aliphatic Alcohols by α- and β-Cyclodextrins and their Partial Methylated Derivatives in Aqueous Solution (2000)
    Springer
    Journal of thermal analysis and calorimetry 61 (2000), S. 23-28 
    Details
    ISSN: 1572-8943
    Keywords: alcohols ; calorimetry ; complex formation ; cyclodextrins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complexation of aliphatic alcohols by α- and β-cyclodextrins and their partially methylated derivatives has been studied by means of calorimetric titrations in aqueous solution. The methyl substituents have no pronounced influence upon the complex formation. α-Cyclodextrin and the partially methylated derivative form with only few exceptions more stable than β-cyclodextrin. With increasing chain length of the alcohols the values of the stability constants and reaction enthalpies increase in case of the complex formation with α-cyclodextrin and partially methylated α-cyclodextrin. In contrast the complex formation becomes disfavoured by the reaction entropy with an increasing number of methylene groups. The values of the reaction enthalpies with the β-cyclodextrins are close to zero. Thus the complexation is only favoured by entropic contributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010140019557
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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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    Paper (German National Licenses)
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