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Molecular/Organic ferromagnets.

J S Miller, A J Epstein, W M Reiff

    Science (New York, N.Y.)
    |April 1, 1988
    PubMed
    Summary
    This summary is machine-generated.

    This study establishes quantitative bulk ferromagnetic behavior in the molecular solid [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-). The research developed a model guiding the creation of new molecular materials for cooperative magnetic coupling.

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    Area of Science:

    • Materials Science
    • Solid-State Physics
    • Organic Chemistry

    Background:

    • Molecular/organic solids with alternating donor-acceptor structures can exhibit cooperative magnetic phenomena.
    • The specific compound [Fe(III)(C(5)Me(5))(2)].(+)[TCNE](-). displays bulk ferromagnetic behavior below 4.8 K.

    Purpose of the Study:

    • To establish quantitative bulk ferromagnetic behavior in [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-).
    • To develop a model for understanding and guiding the design of molecular materials with cooperative magnetic coupling.
    • To investigate the requirements for achieving bulk ferromagnetism in molecular solids.

    Main Methods:

    • Quantitative analysis of bulk ferromagnetic behavior.
    • Development of an extended McConnell model incorporating configuration mixing.

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  • Analysis of critical exponents and magnetic susceptibility.

    • Main Results:

    • Quantitative bulk ferromagnetic behavior was established for [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-).
    • Above 16 K, 1-D chain interactions dominate, transitioning to 3-D bulk effects near the Curie temperature.
    • The developed model predicts specific requirements for ferromagnetic coupling, including stable radicals and specific orbital symmetries.

    Conclusions:

    • The extended McConnell model provides guidance for synthesizing new molecular materials with desired magnetic coupling properties.
    • The model's predictions for Ni(III) and Cr(III) analogs suggest antiferromagnetic and ferrimagnetic behavior, respectively.
    • Achieving bulk ferromagnetism requires ferromagnetic coupling throughout the solid, emphasizing the importance of primary, secondary, and tertiary structures.