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Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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Memanti-nium chloride 0.1-hydrate.

Wei-Jian Lou, Xiu-Rong Hu, Jian-Ming Gu

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary

    The crystal structure of (3,5-dimethyl-1-adamantyl)ammonium chloride reveals a unique arrangement of memanti-nium cations and chloride anions. This structure forms channels housing disordered water molecules, linked by hydrogen bonds.

    Area of Science:

    • Crystal structure analysis
    • Supramolecular chemistry
    • Materials science

    Background:

    • Understanding the packing of organic cations and anions is crucial for materials design.
    • Adamantane derivatives offer unique structural rigidity and potential applications.
    • Hydrogen bonding plays a key role in stabilizing crystal lattices.

    Purpose of the Study:

    • To elucidate the crystal structure of (3,5-dimethyl-1-adamantyl)ammonium chloride monohydrate.
    • To investigate the intermolecular interactions, including hydrogen bonding, within the crystal lattice.
    • To characterize the behavior of water molecules within the crystal structure.

    Main Methods:

    • Single-crystal X-ray diffraction was employed to determine the crystal structure.

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  • Analysis of bond lengths, bond angles, and hydrogen bonding networks was performed.
  • Conformational analysis of the adamantyl cation was conducted.

    • Main Results:

    • The crystal structure consists of (3,5-dimethyl-1-adamantyl)ammonium cations, chloride anions, and disordered water molecules.
    • The memanti-nium cation adopts chair conformations in its six-membered rings.
    • N-H⋯Cl hydrogen bonds link the cation and anion, forming channels that accommodate water molecules.
    • Water molecules are located on a threefold rotation axis and participate in O-H⋯Cl hydrogen bonding with chloride anions.

    Conclusions:

    • The study provides a detailed structural description of (3,5-dimethyl-1-adamantyl)ammonium chloride monohydrate.
    • The observed hydrogen bonding network dictates the formation of channels for water molecules.
    • This structural insight could inform the design of related materials with specific host-guest properties.