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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Visualizing the Dynamics of Temperature- and Solvent-Responsive Soft Crystals.

Jiandong Pang1,2, Caiping Liu1, Yougui Huang3

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Summary

Flexible metal-organic frameworks (MOFs) show significant structural changes in response to temperature and solvents. These materials exhibit record-high thermal expansion and large shrinkage, driven by linker rotations and deformations.

Keywords:
X-ray snapshot analysesmetal-organic frameworkssolvent responsivestimuli-responsive materialstemperature responsive

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Area of Science:

  • Materials Science
  • Crystallography
  • Chemistry

Background:

  • Flexible metal-organic frameworks (MOFs) are advanced porous materials with dynamic structures.
  • Understanding stimuli-responsive behavior in MOFs is crucial for designing new functional materials.

Purpose of the Study:

  • To investigate the temperature and solvent-induced structural transformations in a series of flexible MOFs (FJI-H11-R).
  • To quantify the anisotropic thermal expansion and desolvation-induced shrinkage of these MOFs.

Main Methods:

  • In situ single-crystal X-ray diffraction was employed to visualize structural changes.
  • Characterization of thermal expansion and desolvation effects was performed.

Main Results:

  • Three flexible MOFs (FJI-H11-R) demonstrated reversible structural responses to temperature and solvents.
  • A record-high uniaxial positive thermal expansion coefficient of 653.2×10⁻⁶ K⁻¹ was observed in FJI-H11-Me.
  • Significant c-axial shrinkage (32.4%) occurred upon desolvation.

Conclusions:

  • The structural transformations are attributed to the rotation and deformation of organic linkers.
  • These findings highlight the potential of FJI-H11-R MOFs for applications requiring significant structural responses to external stimuli.