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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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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Mixed-metal metal-organic frameworks.

Sara Abednatanzi1, Parviz Gohari Derakhshandeh, Hannes Depauw

  • 1Center for Ordered Materials, Organometallics and Catalysis, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium. Pascal.Vandervoort@ugent.be Karen.Leus@ugent.be.

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Mixed-metal MOFs offer enhanced properties for gas storage, catalysis, and sensing due to their tunable structures. Accurate characterization is key to unlocking their full potential in these emerging applications.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Mixed-metal MOFs incorporate multiple distinct metal ions within their framework.
  • Their synthesis is achievable through one-pot methods or post-synthetic ion exchange.
  • Accurate characterization of mixed-metal MOFs presents significant challenges.

Purpose of the Study:

  • To review the synthesis, characterization, and applications of mixed-metal MOFs.
  • To highlight the advantages of mixed-metal MOFs over monometallic counterparts.
  • To discuss emerging applications and ongoing challenges in the field.

Main Methods:

  • Utilizing advanced characterization techniques such as X-ray absorption spectroscopy, magnetic resonance, and electron microscopy.
  • Employing multi-scale computational modeling.
  • Comparing various synthesis strategies for mixed-metal MOF preparation.

Main Results:

  • Mixed-metal MOFs demonstrate improved performance in gas sorption, storage, and flexible framework applications.
  • They enable novel catalytic cascade and tandem reactions.
  • Applications in luminescence and sensing, particularly with lanthanide-based MOFs, show great promise.

Conclusions:

  • Mixed-metal MOFs offer significant advantages over monometallic MOFs in various applications.
  • Despite synthesis ease, challenges in characterization and stability remain.
  • Further research is needed to fully exploit the potential of these advanced materials.