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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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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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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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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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Un marco orgánico covalente ligado a la azina.

Sasanka Dalapati1, Shangbin Jin, Jia Gao

  • 1Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences , 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan.

Journal of the American Chemical Society
|November 5, 2013
PubMed
Resumen

Los nuevos marcos orgánicos covalentes (COF) con columnas de pireno exhiben una alta luminiscencia y porosidad. Estos COF ligados a la azina demuestran una sensibilidad y selectividad excepcionales para detectar explosivos como el 2,4,6-trinitrofenol.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Química orgánica es la química orgánica.

Sus antecedentes:

  • Las estructuras orgánicas covalentes (COF) son polímeros porosos cristalinos con estructuras sintonizables.
  • Los materiales a base de pireno son conocidos por sus propiedades fotofísicas únicas.
  • El desarrollo de COF robustos y funcionales para aplicaciones de detección sigue siendo un desafío clave.

Objetivo del estudio:

  • Para sintetizar nuevos marcos orgánicos covalentes bidimensionales (COF) utilizando bloques de construcción de pireno.
  • Investigar las propiedades estructurales, porosas y fotofísicas de los COF ligados a la azina resultantes.
  • Evaluar el rendimiento de los COF en aplicaciones de quimiosensores, particularmente para la detección de explosivos.

Principales métodos:

  • La condensación solvotermal de hidrazina con 1,3,6,8-tetráquico y 4-formilfenilpireno.
  • Caracterización mediante difracción de rayos X para la determinación de la cristalinidad y la estructura.
  • Mediciones de adsorción de gas para determinar el área de superficie y la porosidad.
  • Espectroscopia de fotoluminiscencia para evaluar las propiedades de la luminiscencia.
  • Experimentos de quimiosensibilidad para la detección selectiva de 2,4,6-trinitrofenol.

Principales resultados:

  • Se sintetizaron con éxito COFs altamente cristalinos bidimensionales ligados a la azina.
  • Los marcos exhiben un orden periódico de columnas de pireno y canales microporosos unidimensionales.
  • Los COF poseen una porosidad permanente, una gran superficie y una excelente estabilidad química.
  • El ordenamiento de las columnas de pireno conduce a una fuerte luminiscencia.
  • Las unidades de azina actúan como sitios efectivos para las interacciones de enlace de hidrógeno.
  • Los COF demostraron una alta sensibilidad y selectividad para la detección de 2,4,6-trinitrofenol (un explosivo).

Conclusiones:

  • Los FOC de pireno ligado a la azina desarrollados ofrecen una plataforma prometedora para materiales avanzados.
  • Su estructura única, luminiscencia y porosidad permiten una quimiosensorización altamente sensible y selectiva.
  • Esta estrategia se puede extender para crear diversos materiales funcionales para diversas aplicaciones.