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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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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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Single-Crystal Three-Dimensional Covalent Organic Framework Constructed from 6-Connected Triangular Prism Node.

Ying Yin1, Ya Zhang1,2, Xu Zhou1

  • 1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.

Journal of the American Chemical Society
|October 4, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel triangular prism node to create a new 3D covalent organic framework (3D COF). This material exhibits exceptional sulfur hexafluoride (SF6) adsorption and selectivity, advancing porous materials for gas capture.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Limited structural diversity in 3D covalent organic frameworks (3D COFs) hinders their application.
  • Development of highly connected polyhedral nodes is crucial for expanding 3D COF libraries.

Purpose of the Study:

  • To design and synthesize a novel 6-connected triangular prism node.
  • To construct a new 3D COF using this node and explore its properties.
  • To investigate the potential of this 3D COF for gas adsorption applications.

Main Methods:

  • Rational design of a 6-connected triangular prism node from triphenylbenzene.
  • Construction of a novel 3D COF (3D-TMTAPB-COF) via imine condensation.
  • Single-crystal X-ray diffraction to determine the crystal structure and topology (acs, 6-fold interpenetration).
  • Gas adsorption measurements for SF6 and N2 at 298 K and 1 bar.

Main Results:

  • A new 6-connected triangular prism node was successfully synthesized.
  • A novel 3D COF (3D-TMTAPB-COF) with a rare 6-fold interpenetrated acs topology was constructed.
  • Large single crystals (∼15 μm) of the 3D COF were obtained via solvothermal methods without modulators.
  • The 3D-TMTAPB-COF demonstrated high SF6 adsorption capacity (60.9 cm3 g-1) and SF6/N2 selectivity (335).

Conclusions:

  • The study confirms the feasibility of growing large-size single-crystal 3D COFs using strong covalent bonds via solvothermal methods without modulators.
  • A novel triangular prism node was reported, offering new possibilities for constructing 3D COFs.
  • The synthesized 3D COF shows promising performance for SF6 capture, surpassing many existing crystalline porous materials.