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Related Concept Videos

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.
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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.
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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.
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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
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

An n-channel two-dimensional covalent organic framework.

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
Summary
This summary is machine-generated.

A novel two-dimensional covalent organic framework (2D-NiPc-BTDA COF) was synthesized, exhibiting electron-transporting properties and enhanced near-infrared photon sensitivity. This material shows high electron mobility, paving the way for advanced optoelectronic applications.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers with diverse applications.
  • Metallophthalocyanines are known for their electronic and optical properties.
  • Electron-deficient building blocks can tune the electronic characteristics of COFs.

Purpose of the Study:

  • To synthesize a novel two-dimensional covalent organic framework (2D-NiPc-BTDA COF) by co-condensing metallophthalocyanine with benzothiadiazole.
  • To investigate the structural and electronic properties of the resulting COF.
  • To evaluate its potential for optoelectronic applications, particularly in the near-infrared region.

Main Methods:

  • Co-condensation reaction between metallophthalocyanine and an electron-deficient benzothiadiazole (BTDA) block.
  • Characterization of the 2D-NiPc-BTDA COF structure and morphology.
  • Measurement of optical absorbance, photoconductivity, and electron mobility.

Main Results:

  • Formation of a belt-shaped 2D-NiPc-BTDA COF with AA stacking.
  • Switch from hole-transporting to electron-transporting behavior upon BTDA integration.
  • Broadened absorbance up to 1000 nm and panchromatic photoconductivity.
  • High electron mobility of 0.6 cm(2) V(-1) s(-1) and high sensitivity to near-infrared photons.

Conclusions:

  • The integration of BTDA blocks effectively modifies the electronic properties of metallophthalocyanine-based COFs.
  • 2D-NiPc-BTDA COF demonstrates promising characteristics for near-infrared optoelectronics.
  • This work presents a new strategy for designing functional COFs with tunable charge transport.