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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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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,...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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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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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Recent Progress in External-Stimulus-Responsive 2D Covalent Organic Frameworks.

Pengfei She1, Yanyan Qin2, Xiang Wang1

  • 1Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

Smart 2D covalent organic frameworks (COFs) exhibit reversible changes in response to stimuli like light and temperature. This review highlights their design, mechanisms, and applications in sensors and photoelectronic devices.

Keywords:
2D covalent organic frameworkschemical sensorsfunctional materialsphotoelectronic devicesstimulus-responsive behaviors

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Smart 2D covalent organic frameworks (COFs) integrate structural features with functional units.
  • These materials display reversible changes in conformation, color, and luminescence upon external stimuli exposure.

Purpose of the Study:

  • To review recent advancements in 2D COFs responsive to various external stimuli.
  • To discuss design strategies, responsive mechanisms, and applications in chemical sensors and photoelectronic devices.

Main Methods:

  • Literature review of recent research on stimulus-responsive 2D COFs.
  • Analysis of responsive mechanisms and design principles.
  • Summary of applications in sensing and optoelectronics.

Main Results:

  • 2D COFs respond to stimuli including metal ions, gas molecules, pH, temperature, electricity, and light.
  • Responsive mechanisms and design strategies are elucidated.
  • Applications in chemical sensors and photoelectronic devices are demonstrated.

Conclusions:

  • Stimulus-responsive 2D COFs offer tunable properties for advanced applications.
  • This review provides guidelines for designing novel single-/multistimulus-responsive 2D COFs.
  • Controllable responsive behaviors are key for future photoelectronic device development.