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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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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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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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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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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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Marco orgánico covalente tridimensional con topología

Zonglong Li1, Li Sheng1, Hangchao Wang1

  • 1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.

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|December 17, 2020
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Resumen

Los investigadores desarrollaron un nuevo marco orgánico covalente 3D (3D-COF) con una nueva topología (ceq). Este material poroso exhibe una absorción eficiente de gases para el CO2, el CH4 y el H2, lo que amplía las aplicaciones para los 3D-COF.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química

Sus antecedentes:

  • Las estructuras orgánicas covalentes tridimensionales (3D-COF) son materiales porosos avanzados con estructuras sintonizables.
  • Las topologías 3D-COF existentes son limitadas debido a los desafíos en el diseño de unidades de construcción 3D y la reversibilidad de enlaces.

Objetivo del estudio:

  • Introducir un nuevo 3D-COF con una topología no reportada anteriormente.
  • Explorar las características estructurales y las propiedades de absorción de gases del nuevo 3D-COF.

Principales métodos:

  • Síntesis de un 3D-COF utilizando un vértice de prisma triangular simétrico D3 y un enlazador triangular plano.
  • Caracterización de la estructura y superficie del COF utilizando técnicas como el análisis BET.
  • Mediciones de la absorción de gases para evaluar la absorción de CO2, CH4 y H2.

Principales resultados:

  • Se sintetizó con éxito un nuevo 3D-COF con la topología 'ceq'.
  • El material exhibió una estructura de doble interpenetración con una alta superficie de Brunauer-Emmett-Teller de 1148,6 m2 g-1.
  • El 3D-ceq-COF demostró una absorción eficiente de CO2, CH4 y H2.

Conclusiones:

  • Este estudio presenta nuevas unidades de construcción y estrategias sintéticas para crear diversos COF 3D.
  • La novedosa topología "ceq" amplía las posibilidades estructurales de los COF 3D.
  • Las capacidades eficientes de absorción de gas resaltan las aplicaciones potenciales de este nuevo material.