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  • aliphatic acids  (1)
  • cationic guests  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Complexation of aliphatic dicarboxylic acids and anions by alpha-cyclodextrin (1990)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 9 (1990), S. 277-285 
    Details
    ISSN: 1573-1111
    Schlagwort(e): α-Cyclodextrin ; aliphatic acids ; aqueous solution ; thermodynamic parameters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Inclusion complexes are formed in aqueous solution between α-cyclodextrin and several straight-chain alkanedioic acids (ethanedioic, propanedioic, butanedioic, pentanedioic, hexanedioic, heptanedioic and octanedioic acids), several corresponding anions, several straight-chain alkenedioic acids (cis-butanedioic,trans-butanedioic andt,t-2,4-hexadienedioic acids) and several corresponding anions. Formation constants for these complexes were determined by measuring the effect of complexation on the pH of cyclohexaamylose/acid/base buffer equilibria. Enthalpies and entropies of complexation were calculated from the temperature dependences of the formation constants. The observed trends in the thermodynamic parameters lead to hypotheses about the structures of the complexes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01033307
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Complexation of adamantane-ammonium substrates by beta-cyclodextrin and itsO-methylated derivatives (1989)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 7 (1989), S. 537-543 
    Details
    ISSN: 1573-1111
    Schlagwort(e): Cyclodextrin ; formation constant ; uv-visible spectrophotometry ; cationic guests
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A spectrophotometric method is used to determine formation constants of complexes ofβ-cyclodextrin, the 2,6-di-O-methylated and 2,3,6-tri-O-methylated derivatives ofβ-cyclodextrin as hosts with adamantan-1-ylammonium, adamantan-2-ylammonium and adamantan-1-ylmethylammonium as substrate species. The spectrophotometric method uses methyl orange anion and acid forms as indicator species. Complexes of the cyclodextrins with these species are determined as well as with the adamantane derivatives. Standard enthalpies and entropies of formation of all complexes are calculated from the temperature variation of the equilibrium constants.β-Cyclodextrin and its 2,6-O-methyl derivative have comparable complex strengths with adamantaneammonium substrates and these strengths are about two orders of magnitude stronger than the corresponding complexes of the permethylated derivative. Thermodynamic parameters are interpreted in terms of differing intramolecular properties of the cyclodextrin complexes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01080464
    Standort Signatur Erwartet Verfügbarkeit
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