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A room-temperature molecular/organic-based magnet.

J M Manriquez, G T Yee, R S McLean

    Science (New York, N.Y.)
    |June 7, 1991
    PubMed
    Summary
    This summary is machine-generated.

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    A novel vanadium-tetracyanoethylene compound exhibits room-temperature magnetic hysteresis. This ferrimagnetic material

    Area of Science:

    • Materials Science
    • Magnetism
    • Inorganic Chemistry

    Background:

    • Bis(benzene)vanadium is a known organometallic compound.
    • Tetracyanoethylene (TCNE) is a strong electron acceptor.
    • Organometallic compounds can exhibit interesting magnetic properties.

    Purpose of the Study:

    • To synthesize and characterize a new magnetic material from bis(benzene)vanadium and TCNE.
    • To investigate the magnetic properties of the resulting solid, including magnetization and hysteresis.
    • To determine the composition and magnetic coupling mechanism of the novel compound.

    Main Methods:

    • Reaction of bis(benzene)vanadium with tetracyanoethylene.
    • Magnetic susceptibility measurements.
    • Infrared spectroscopy.

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    Main Results:

    • An insoluble amorphous black solid with the empirical composition V(TCNE)x.Y(CH(2)Cl(2)) (x≈2, Y≈1/2) was synthesized.
    • The material exhibits field-dependent magnetization and hysteresis at room temperature.
    • The critical temperature exceeds 350 K, the decomposition point of the sample.

    Conclusions:

    • The synthesized vanadium-TCNE material displays ferrimagnetic behavior.
    • Three-dimensional antiferromagnetic exchange between donor and acceptor spins is proposed as the magnetic coupling mechanism.
    • The material's high critical temperature suggests potential applications in magnetic devices.