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Non-Interpenetrated Single-Crystal Covalent Organic Frameworks.

Lin Liang1, Yi Qiu2, Wei David Wang1

  • 1State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China.

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|July 11, 2020
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Summary

Researchers developed LZU-306, a novel non-interpenetrated single-crystal covalent organic framework (COF). This breakthrough enables studying aggregation-induced emission molecules in isolation, advancing materials science applications.

Keywords:
3D COFsmatrix isolationnon-interpenetrated frameworkssingle crystalssolid-state NMR

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Area of Science:

  • Materials Science
  • Chemistry
  • Solid-State Physics

Background:

  • Growing single crystals of covalent organic frameworks (COFs) with open structures is a significant challenge.
  • The inaccessibility of such materials hinders the development of structure-oriented applications.

Purpose of the Study:

  • To report the first non-interpenetrated single-crystal COF with an open structure, named LZU-306.
  • To utilize LZU-306 as a platform for investigating the dynamics of functional moieties in an isolated state.

Main Methods:

  • Covalent assembly for constructing the COF.
  • Solid-state 2H NMR spectroscopy to probe molecular dynamics.
  • High void volume characterization (80%).

Main Results:

  • Successfully synthesized LZU-306, a non-interpenetrated single-crystal COF with high porosity.
  • Determined unprecedentedly fast rotation of benzene rings in reticulated tetraphenylethylene (TPE) within LZU-306 (1.0×10^4 Hz at 203 K to 1.5×10^7 Hz at 293 K).
  • Demonstrated LZU-306 as an effective matrix-isolation platform.

Conclusions:

  • LZU-306 represents a new approach to growing open-structured single-crystal frameworks.
  • The study provides a unique platform for studying the intrinsic dynamics of functional molecules in a well-defined, isolated environment.
  • This work opens avenues for structure-property relationship studies in materials science.