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Videos de Conceptos Relacionados

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...

Paramagnetism

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...

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.

Magnetism

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...

Magnetic Susceptibility and Permeability

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

π Electron Effects on Chemical Shift: Overview

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

Un imán basado en moléculas/orgánicos a temperatura ambiente.

J M Manriquez, G T Yee, R S McLean

Science (New York, N.Y.)

|June 7, 1991

Resumen

Un nuevo compuesto de vanadio-tetracianoetileno exhibe histeresis magnética a temperatura ambiente. Este material ferrimagnético es

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
El magnetismo es el magnetismo.
Química Inorgánica La Química Inorgánica es la química inorgánica.

Sus antecedentes:

El bis (benceno) vanadio es un compuesto organometálico conocido.
El tetracianoetileno (TCNE) es un fuerte aceptador de electrones.
Los compuestos organometálicos pueden exhibir interesantes propiedades magnéticas.

Objetivo del estudio:

Para sintetizar y caracterizar un nuevo material magnético a partir de bis (benceno) vanadio y TCNE.
Para investigar las propiedades magnéticas del sólido resultante, incluyendo la magnetización e histeresis.
Para determinar la composición y el mecanismo de acoplamiento magnético del nuevo compuesto.

Principales métodos:

Reacción del bis ((benceno) vanadio con el tetracianoetileno.

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Mediciones de la susceptibilidad magnética.

Espectroscopia por infrarrojos. espectroscopia por infrarrojos. espectroscopia por infrarrojos.

Principales resultados:

Se sintetizó un sólido negro amorfo insoluble con la composición empírica V(TCNE) x.Y(CH(2) Cl(2)) (x≈2, Y≈1/2).
El material exhibe una magnetización dependiente del campo y una histeresis a temperatura ambiente.
La temperatura crítica excede 350 K, el punto de descomposición de la muestra.

Conclusiones:

El material de vanadio-TCNE sintetizado muestra un comportamiento ferrimagnético.
Se propone como mecanismo de acoplamiento magnético el intercambio antiferromagnético tridimensional entre los espines donante y aceptador.
La alta temperatura crítica del material sugiere aplicaciones potenciales en dispositivos magnéticos.