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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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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Crystal Field Theory
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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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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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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Cadros orgánicos covalentes 2D entrelazados de nodos sobrepoblados

Elisabet De Bolòs1, Saibal Bera1, Karol Strutyński2

  • 1POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, Donostia-San Sebastián 20018, Spain.

Journal of the American Chemical Society
|January 13, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método para crear marcos orgánicos covalentes 2D entrelazados (COF) utilizando bloques de construcción aromáticos estéricamente obstaculizados. Este enfoque evita el apilamiento π, lo que permite nuevas arquitecturas de COF.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química supramolecular
  • Nanotecnología

Sus antecedentes:

  • La interpenetración es una característica común en los marcos orgánicos covalentes 3D (COF), pero rara en los COF 2D debido al apilamiento π.
  • Los FOC 2D entrelazados existentes se derivan típicamente de monómeros con grupos arilo dispuestos perpendicularmente.

Objetivo del estudio:

  • Informar sobre la síntesis de un nuevo COF 2D entrelazado utilizando hidrocarburos aromáticos policíclicos estéricamente saturados.
  • Investigar las propiedades estructurales y electrónicas del COF 2D entrelazado resultante.

Principales métodos:

  • Síntesis de COF a partir de monómeros de hidrocarburos aromáticos policíclicos estéricamente superpoblados
  • Caracterización mediante microscopía, sorción de gases, espectroscopia y mediciones de transporte de carga.

Principales resultados:

  • Con éxito sintetizó un COF 2D entrelazado de monómeros aromáticos estéricamente superpoblados.
  • Demostró la ausencia de apilamiento de π entre capas debido a la arquitectura interconectada.
  • La caracterización confirmó la estructura y las propiedades únicas, incluido el transporte de carga.

Conclusiones:

  • Los sistemas aromáticos estériles superpoblados son monómeros eficaces para la generación de COF 2D mecánicamente entrelazados.
  • Esta estrategia ofrece nuevas posibilidades para el diseño de FOC con topologías y propiedades no convencionales.
  • La ausencia de apilamiento π en estos COF 2D entrelazados abre caminos para nuevas aplicaciones.