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Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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Cooperative Allosteric Transitions01:58

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Crystal Field Theory
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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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A controllable gate effect in cobalt(II) organic frameworks by reversible structure transformations.

Qiang Chen1, Ze Chang, Wei-Chao Song

  • 1Department of Chemistry, TKL of Metal- and Molecule-based Material Chemistry and Synergetic Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071 (China).

Angewandte Chemie (International Ed. in English)
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

A novel cobalt-based metal-organic framework (MOF) transforms color with stimuli, enabling solvent molecule encapsulation. This study details the first 3D MOF topology transformation from self-penetrating to interpenetrating nets.

Keywords:
cobaltgate effectmetal-organic frameworkssensorssingle-crystal transformation

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are crystalline porous materials with diverse applications.
  • Reversible transformations in MOFs are crucial for developing responsive materials.
  • Understanding MOF structural dynamics is key to controlling their properties.

Purpose of the Study:

  • To investigate the stimuli-responsive behavior of a cobalt-based MOF.
  • To explore the relationship between structural transformation and guest molecule encapsulation.
  • To report the first instance of a 3D MOF exhibiting a topology transformation from self-penetrating to interpenetrating nets.

Main Methods:

  • Synthesis of a cobalt-based MOF (BP).
  • Exposure to water (H2O) and ammonia (NH3) stimuli to induce color change and structural transformation.
  • Analysis of ligand removal/recovery and its effect on pore accessibility.
  • Characterization of the MOF's topology before and after transformation.

Main Results:

  • The blue MOF BP reversibly transforms to a red phase (RP) upon exposure to H2O or NH3.
  • This transformation involves the removal and recovery of terephthalate ligands.
  • A gate effect is observed, facilitating the controlled encapsulation and release of solvent molecules.
  • The study demonstrates a unique topology transformation from a self-penetrating to an interpenetrating net in 3D MOFs.

Conclusions:

  • The cobalt-based MOF exhibits reversible color and structural changes in response to chemical stimuli.
  • The observed gate effect enables controlled guest molecule sorption, highlighting potential applications in separation and storage.
  • This work presents a novel example of topology transformation in 3D MOFs, expanding the understanding of MOF structural diversity.