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Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...

Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

Magnetic Field Lines

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:

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Related Experiment Video

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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

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Magnetic blocking in a linear iron(I) complex.

Joseph M Zadrozny¹, Dianne J Xiao, Mihail Atanasov

¹Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.

Nature Chemistry

|June 22, 2013

Summary

This summary is machine-generated.

Researchers developed a novel two-coordinate iron(I) complex, a potential building block for single-molecule magnets. This transition metal complex exhibits a record spin-reversal barrier, paving the way for smaller, faster spin-based electronics.

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Area of Science:

* Inorganic Chemistry
* Materials Science
* Quantum Computing

Background:

* Single-molecule magnets (SMMs) are key for developing molecular spintronic devices.
* High magnetic anisotropy is crucial for SMMs to maintain spin states.
* Lanthanide-based SMMs show promise but are limited in scalability.

Purpose of the Study:

* To explore transition metals for SMMs with high magnetic anisotropy.
* To synthesize and characterize a low-coordinate iron complex.
* To investigate the magnetic properties of the novel iron complex.

Main Methods:

* Synthesis of a two-coordinate iron(I) complex: [Fe(C(SiMe3)3)2](-).
* Alternating current magnetic susceptibility measurements.
* Analysis of magnetic relaxation and spin-reversal barrier.

Main Results:

* The iron(I) complex exhibits slow magnetic relaxation below 29 K.
* An effective spin-reversal barrier (Ueff) of 226(4) cm⁻¹ was measured.
* This represents the highest barrier for a transition metal-based SMM.

Conclusions:

* Low coordination numbers in transition metals can yield high magnetic anisotropy.
* The reported iron(I) complex is a promising candidate for SMM applications.
* This work advances the development of molecular spintronics and quantum computing.