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  • crown ethers  (3)
  • cucurbituril  (2)
  • Springer  (5)
  • 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
    Cucurbituril and α- and β-Cyclodextrins as Ligands for the Complexation of Nonionic Surfactants and Polyethyleneglycols in Aqueous Solutions (2000)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 37 (2000), S. 231-236 
    Details
    ISSN: 1573-1111
    Keywords: cucurbituril ; cyclodextrin ; nonionic surfactants ; complex formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The complexation of nonionicsurfactants and polyethylene glycols by the ligandscucurbituril, α- and β-cyclodextrin wasstudied in aqueous solution. All the examined guestmolecules form complexes with these ligands.Calorimetric titrations were performed to determinedirectly the stability constants and reactionenthalpies. The presence of an aromatic part innonionic surfactants leads to more stable complexeswith β-cyclodextrin than with the other ligands.If the surfactants contain no benzene group, theinteractions with α-cyclodextrin are strongercompared to other ligands. The chain length of thepolyethylene glycols has only an influence upon thevalues of the reaction enthalpy in the case ofα-cyclodextrin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008148831359
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  • 4
    Electronic Resource
    Electronic Resource
    Stabilization of dyes against hydrolytic decomposition by the formation of inclusion compounds (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 14 (1992), S. 91-99 
    Details
    ISSN: 1573-1111
    Keywords: Dye complexes ; inclusion compounds ; cyclodextrins ; cucurbituril
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The decomposition reactions of the dyes phenol blue and murexide were measured spectroscopically in acidic solution at different temperatures. From these reaction rates and their temperature dependence in the absence and presence of various hosts, the stability constants and the reaction enthalpies of the dye complexes with noncyclic dextrins, cyclodextrins and cucurbituril were calculated.β-Cyclodextrin enhances the stability of phenol blue in acidic solution. This effect is even more pronounced with cucurbituril. Due to the molecular structure of murexide this dye cannot form inclusion complexes with hosts containing hydrophobic cavities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029656
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  • 5
    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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