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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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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Encoding ordered structural complexity to covalent organic frameworks.

Lei Wei1, Xinyue Hai1, Tongtong Xu1

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, P. R. China.

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|March 19, 2024
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Summary

Researchers created a complex covalent organic framework (COF-305) with a large unit cell. This framework showcases ordered chemical complexity, offering new insights into designing advanced synthetic materials.

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Area of Science:

  • Materials Science
  • Crystallography
  • Organic Chemistry

Background:

  • Designing ordered and complex synthetic materials is crucial for advanced applications.
  • Crystalline frameworks with controlled chemical distributions offer a pathway to such materials.

Purpose of the Study:

  • To construct and characterize a novel covalent organic framework (COF-305) with unprecedented ordered complexity.
  • To investigate the principles governing the formation of complex chemical sequences within molecular frameworks.

Main Methods:

  • Synthesis of COF-305 using tetrakis(4-aminophenyl)methane and 2,3-dimethoxyterephthalaldehyde.
  • Analysis of the unit cell and asymmetric unit size of the resulting COF.
  • Investigation of the stereoisomer distribution and spatial arrangement of constituents within the framework.

Main Results:

  • COF-305 was successfully synthesized, exhibiting the largest unit cell and asymmetric unit among known covalent organic frameworks.
  • The framework displays ordered complexity due to nine distinct stereoisomers occupying specific sites.
  • Constituent building blocks adapted their packing geometries to accommodate framework formation, deviating from preferred molecular crystal structures.

Conclusions:

  • COF-305 demonstrates a new level of ordered complexity in covalent organic frameworks.
  • The study highlights the role of non-covalent interactions in covalent reticular design.
  • This work opens avenues for creating molecular frameworks with intricate chemical sequences.