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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Network Covalent Solids02:18

Network Covalent Solids

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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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Crystal Field Theory - Octahedral Complexes02:58

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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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Aromatic Hydrocarbon Anions: Structural Overview01:18

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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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,...
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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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3D Covalent Organic Framework with "the" Topology.

Saikat Das1, Haruna Mabuchi2, Tsukasa Irie2

  • 1Research Institute for Science & Technology, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.

Small (Weinheim an Der Bergstrasse, Germany)
|January 27, 2024
PubMed
Summary

Researchers developed TUS-38, a novel 3D covalent organic framework (COF), demonstrating exceptional iodine vapor uptake. This new COF material shows high capacity and recyclability for potential applications.

Keywords:
covalent organic frameworkiodine captureradioactive wastereticular designthe net topology

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Discovering new topologies in covalent organic frameworks (COFs) is crucial for designing advanced materials.
  • Understanding structure-property relationships guides the development of functional architectures.

Purpose of the Study:

  • To report the synthesis and characterization of a novel 3D COF, TUS-38.
  • To investigate the iodine vapor adsorption capabilities of the new COF material.

Main Methods:

  • Reticular chemistry utilizing [3+8] reversible imine condensation.
  • Characterization of the 3D COF structure and porosity.
  • Iodine vapor uptake measurements and density functional theory (DFT) calculations.

Main Results:

  • The first 3D COF, TUS-38, with a unique topology was successfully constructed.
  • TUS-38 exhibits a twofold interpenetrated multidirectional pore network.
  • Achieved an exemplary iodine vapor uptake capacity of 6.3 g g⁻¹.
  • Demonstrated high crystallinity and structural integrity.
  • The material retained 95% of its adsorption capacity after five reuse cycles.

Conclusions:

  • TUS-38 represents a significant advancement in COF topology and design.
  • The nitrogen-rich framework facilitates strong interactions with iodine, enabling high uptake.
  • DFT calculations provide insights into the adsorption mechanism.