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Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Solution-Processable Metal-Organic Framework Featuring Highly Tunable Dynamic Aggregation States.

Lin Geng1, Yang Qiao2, Rui Sun2

  • 1College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|December 3, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a solution-processable metal-organic framework (MOF) with tunable aggregation. This breakthrough allows dynamic control over its properties, enabling reversible circularly polarized luminescence (CPL) switching for advanced applications.

Keywords:
aggregation tunablecircularly polarized luminescencedynamic self‐assemblymetal‐organic frameworksolution‐processable

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Limited processability of metal-organic frameworks (MOFs) restricts their application scope.
  • Controlling MOF aggregation state is crucial for advanced functionalities.

Purpose of the Study:

  • To develop a highly processable Mg-based MOF with dynamic aggregation control.
  • To achieve reversible switching of circularly polarized luminescence (CPL) through aggregation modulation.

Main Methods:

  • Facile synthesis of a solution-processable Mg-based MOF (NKU-Mg-1).
  • Dynamic self-assembly (DySA) for controlling aggregation state via coordination bond dynamics.
  • 3D electron diffraction for structural analysis of solid-phase aggregation.
  • Incorporation of chiral modules for CPL activity.

Main Results:

  • NKU-Mg-1 exhibits tunable aggregation, transitioning from micron-sized crystals to nano-sized colloids (50-1000 nm).
  • Aggregation state directly influences emission properties.
  • Solid-phase aggregation controlled via structural transitions between 3D and 2D nano-crystals.
  • Achieved significant CPL activity (g_lum up to 0.01) with reversible switching.

Conclusions:

  • Solution-processable MOFs with dynamic aggregation control are achievable.
  • Tunable aggregation enables precise modulation of CPL activity.
  • This work presents promising MOF materials for advanced applications requiring dynamic control.