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Videos de Conceptos Relacionados

Paramagnetism01:30

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...
Ferromagnetism01:31

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...
Magnetic Susceptibility and Permeability01:31

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...
Diamagnetism01:26

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.
Colors and Magnetism03:02

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.
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...

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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Un interruptor paramagnético no covalentemente reversible en el agua.

Alexander T Buck1, Joseph T Paletta, Shalika A Khindurangala

  • 1Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.

Journal of the American Chemical Society
|July 9, 2013
PubMed
Resumen

Los investigadores desarrollaron un interruptor organo-paramagnético utilizando un bi-radical. Esta molécula cambia de manera reversible los estados magnéticos en el agua utilizando cucurbita[7]uril, lo que permite nuevas aplicaciones electrónicas y de detección.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Ciencia de los materiales Ciencia de los materiales.
  • Electrónica orgánica y electrónica orgánica.

Sus antecedentes:

  • El desarrollo de materiales magnéticos conmutables es crucial para las tecnologías avanzadas.
  • Los sistemas radicales basados en Viologen ofrecen potencial para el control de las propiedades magnéticas.
  • La química huésped-huésped proporciona una plataforma para la conmutación molecular.

Objetivo del estudio:

  • Para diseñar y caracterizar un nuevo interruptor organo-paramagnético.
  • Para demostrar el ciclo del estado magnético reversible utilizando interacciones no covalentes.
  • Explorar las aplicaciones potenciales de las moléculas magnéticas conmutables.

Principales métodos:

  • Síntesis de una dication bis ((viologen) diradical vinculada.
  • Investigación de la complejación huésped-anfitrión con cucurbita[7]uril (CB[7]).
  • Caracterización de las propiedades magnéticas en solución acuosa.
  • Modelado computacional de las interacciones radicales.

Principales resultados:

  • Se sintetizó un bis ((viologen) diradical y se demostró que actúa como un interruptor organo-paramagnético.
  • La conmutación reversible entre los estados diamagnético y paramagnético se logró a través de la complicación CB [7] en el agua.
  • El análisis computacional indicó una interacción pi-dimer (pimer) entre las unidades radicales de viologen.

Conclusiones:

  • Este estudio presenta un nuevo interruptor molecular con propiedades magnéticas sintonizables en el agua.
  • Los hallazgos abren vías para la espintrónica, el almacenamiento de datos y la detección química.
  • El sistema desarrollado sirve como un bloque de construcción para materiales magnéticos avanzados y sondas.