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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Cuadros orgánicos covalentes de alta emisión

Sasanka Dalapati1, Enquan Jin2, Matthew Addicoat3

  • 1Field of Energy and Environment, School of Materials Science, Japan Advanced Institute of Science and Technology , 1-1 Asahidai, Nomi 923-1292, Japan.

Journal of the American Chemical Society
|April 26, 2016
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron marcos orgánicos covalentes de alta emisión (COF) utilizando un mecanismo de emisión inducida por agregación (AIE), superando las limitaciones del apagado causado por agregación (ACQ). Estos AIE-COF muestran altos rendimientos cuánticos y detección sensible de amoníaco.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química supramolecular
  • Nanotecnología

Sus antecedentes:

  • Los marcos orgánicos covalentes (COF) suelen sufrir de apagado por agregación (ACQ), lo que limita sus propiedades de luminiscencia.
  • Lograr COFs altamente luminiscentes ha sido un desafío significativo debido al apilamiento π-π en sus estructuras en capas.

Objetivo del estudio:

  • Desarrollar una estrategia general para el diseño de COF de alta emisión.
  • Superar las limitaciones de la CCA en los FOC mediante la introducción de un mecanismo de emisiones inducidas por agregación (EIA).

Principales métodos:

  • Integración de las unidades activas en AIE en los vértices de las estructuras de COF.
  • Síntesis de COF porosos cristalinos con matrices AIE columnares apiladas en π periódicas.
  • Caracterización de las propiedades de luminiscencia y las capacidades de detección de amoníaco.

Principales resultados:

  • Se han diseñado y sintetizado con éxito COFs de alta emisión con unidades AIE integradas.
  • Las matrices π AIE columnares dentro de los COFs dominan la luminiscencia, exhibiendo rendimientos cuánticos excepcionales.
  • Se ha demostrado la detección de amoníaco de alta sensibilidad hasta niveles inferiores a ppm utilizando los AIE-COF.

Conclusiones:

  • La estrategia propuesta supera efectivamente las limitaciones basadas en la ACQ en la luminiscencia de COF.
  • Este trabajo abre nuevas vías para la exploración y el desarrollo de materiales de alta emisión de COF.
  • Los AIE-COF desarrollados son prometedores para aplicaciones sensibles de detección química.