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Aluminum chlorohydrate II: Physicochemical properties

D L Teagarden, J F Radavich, J L White

    Journal of Pharmaceutical Sciences
    |July 1, 1981
    PubMed
    Summary

    Aluminum chlorohydrate contains chloride as a counterion, not a coordinating ligand. Spectroscopic and titration methods confirm a stable, highly charged Al13 poly-cation structure, influencing its morphology and properties.

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    Area of Science:

    • Inorganic Chemistry
    • Materials Science
    • Colloid Chemistry

    Background:

    • Aluminum chlorohydrate is a key inorganic polymer used in various applications.
    • Understanding its precise structure and the role of chloride is crucial for optimizing its performance.

    Purpose of the Study:

    • To elucidate the role of chloride in aluminum chlorohydrate.
    • To characterize the dominant aluminum poly-cation species.
    • To correlate structure with observed morphology.

    Main Methods:

    • Chloride-selective electrode potentiometry
    • Infrared (IR) spectroscopy
    • pH-stat and potentiometric titrations
    • Ferron reaction kinetics
    • Scanning electron microscopy (SEM)

    Main Results:

    • Chloride acts as a counterion, readily exchangeable by other anions.
    • Evidence supports the existence of a stable, highly charged Al13O4(OH)24(H2O)7+12 poly-cation.
    • Potentiometric titration indicates initial hydroxyl adsorption and shielding of the central aluminum atom.
    • SEM reveals a platey morphology consistent with the proposed Al13 structure.

    Conclusions:

    • The structure of aluminum chlorohydrate is dominated by the Al13 poly-cation.
    • Chloride's role as a counterion is confirmed, impacting the material's stability and reactivity.
    • The poly-cation's structure dictates the observed platey morphology.

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