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Videos de Conceptos Relacionados

Network Covalent Solids02:18

Network Covalent Solids

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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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.
CFT focuses on...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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.
Removing one hydrogen from the intervening CH2 group with both...

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Updated: May 30, 2026

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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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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Un marco orgánico covalente bidimensional de n canales y n canales.

Xuesong Ding1, Long Chen, Yoshihito Honsho

  • 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
|August 26, 2011
PubMed
Resumen

Se sintetizó un nuevo marco orgánico covalente bidimensional (2D-NiPc-BTDA COF), que exhibe propiedades de transporte de electrones y una mayor sensibilidad de fotones al infrarrojo cercano. Este material muestra una alta movilidad de electrones, allanando el camino para aplicaciones optoelectrónicas avanzadas.

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Área de la Ciencia:

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

Sus antecedentes:

  • Las estructuras orgánicas covalentes (COF) son polímeros porosos cristalinos con diversas aplicaciones.
  • Las metalloftalocianinas son conocidas por sus propiedades electrónicas y ópticas.
  • Los bloques de construcción con deficiencia de electrones pueden ajustar las características electrónicas de los COF.

Objetivo del estudio:

  • Para sintetizar un nuevo marco orgánico covalente bidimensional (2D-NiPc-BTDA COF) mediante la co-condensación de la metaloftalocianina con el benzothiadiazol.
  • Investigar las propiedades estructurales y electrónicas del COF resultante.
  • Evaluar su potencial para aplicaciones optoelectrónicas, particularmente en la región del infrarrojo cercano.

Principales métodos:

  • Reacción de co-condensación entre la metaloftalocianina y un bloque de benzotiadiazol deficiente en electrones (BTDA).
  • Caracterización de la estructura y morfología del COF 2D-NiPc-BTDA.
  • Medición de la absorbancia óptica, la fotoconductividad y la movilidad de los electrones.

Principales resultados:

  • Formación de un COF 2D-NiPc-BTDA en forma de cinturón con apilamiento AA.
  • Cambia el comportamiento de transporte de agujeros al comportamiento de transporte de electrones después de la integración de BTDA.
  • Absorbancia ampliada hasta 1000 nm y fotoconductividad pancromática.
  • Alta movilidad de electrones de 0,6 cm(2) V(-1) s(-1) y alta sensibilidad a los fotones del infrarrojo cercano.

Conclusiones:

  • La integración de los bloques BTDA modifica efectivamente las propiedades electrónicas de los COF basados en metalloftalocianina.
  • 2D-NiPc-BTDA COF demuestra características prometedoras para la optoelectrónica de infrarrojo cercano.
  • Este trabajo presenta una nueva estrategia para el diseño de COF funcionales con transporte de carga sintonizable.