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Stability constants for complex formation between alpha-cyclodextrin and some amines.

A B Wong, S F Lin, K A Connors

    Journal of Pharmaceutical Sciences
    |April 1, 1983
    PubMed
    Summary
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    Alpha-cyclodextrin forms complexes with various amines. Stability analysis revealed that the 4-substituent on anilines is the primary site for complex binding.

    Area of Science:

    • Supramolecular Chemistry
    • Analytical Chemistry
    • Organic Chemistry

    Background:

    • Cyclodextrins are widely studied for their ability to form inclusion complexes.
    • Understanding host-guest interactions is crucial for applications in drug delivery and separation science.
    • Amine derivatives are common guests in cyclodextrin complexation studies.

    Purpose of the Study:

    • To investigate the complex formation between alpha-cyclodextrin and a series of 15 amines.
    • To determine the stoichiometry and stability constants of these complexes.
    • To elucidate the structural factors influencing the binding affinity.

    Main Methods:

    • Potentiometric titration was the primary method for complexation studies.
    • Direct UV spectrophotometry and competitive indicator spectrophotometry were used as supplementary techniques.

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  • Complex stability constants (K11a, K12a, K11b, K12b) were evaluated for 1:1 and 1:2 complexes.

    • Main Results:

    • Complex formation was observed between alpha-cyclodextrin and all studied amines.
    • Stability constants indicated that K11b was consistently greater than K11a.
    • K12a values were found to be zero for all amine-cyclodextrin complexes.
    • A clear correlation was established between the stability of the complexes and the amine structure.

    Conclusions:

    • The 4-substituent of 4-substituted anilines plays a critical role in the binding interaction with alpha-cyclodextrin.
    • The binding affinity is significantly influenced by the nature of the substituent at the para position.
    • These findings provide insights into the molecular recognition mechanisms in cyclodextrin complexation.