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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.4K
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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.4K
Valence Bond Theory02:42

Valence Bond Theory

8.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
28.2K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.6K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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A zero-valent palladium cluster-organic framework.

Xiyue Liu1, James N McPherson2, Carl Emil Andersen1

  • 1Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs, Lyngby, Denmark.

Nature Communications
|February 8, 2024
PubMed
Summary
This summary is machine-generated.

Researchers created a novel 2D metal-organic framework (MOF) using palladium-3 (Pd3) clusters. This ordered Pd3-MOF acts as a stable catalyst for hydrogenation, enabling precise control over metal nanoparticles.

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Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Controlling the spatial arrangement of nanoscopic metal clusters is crucial for their catalytic activity.
  • Existing methods for dispersing metal clusters often lead to heterogeneity, hindering structure-reactivity relationship studies.
  • Tethering molecular metal clusters into ordered networks offers a potential solution for creating well-defined catalytic sites.

Purpose of the Study:

  • To develop a method for synthesizing ordered arrays of chemically defined metal clusters.
  • To create a novel organometallic framework using pre-assembled palladium-3 (Pd3) clusters.
  • To investigate the structural, stability, and catalytic properties of the resulting framework.

Main Methods:

  • Facile synthesis of a {Pd3} cluster-based organometallic framework (Pd3-MOF) via ligand exchange polymerization.
  • Utilizing ditopic isocyanide ligands for framework assembly.
  • Structure determination using continuous rotation 3D electron diffraction (3D-ED) to ~1.0 Å resolution.

Main Results:

  • Successful synthesis of a 2D coordination network, Pd3-MOF, from molecular triangulo-Pd3(CNXyl)6 clusters.
  • Unambiguous structural determination of the nanocrystalline organometallic polymer using 3D-ED.
  • Pd3-MOF exhibits Pd(0)3 cluster nodes with high thermal and aerobic stability.
  • Demonstrated catalytic activity of Pd3-MOF in hydrogenation reactions.

Conclusions:

  • The study demonstrates a viable approach to creating ordered arrays of metal clusters by tethering them into polymeric networks.
  • Pd3-MOF represents a stable, catalytically active material with potential for precise control over metal nanoparticle assembly.
  • This work opens avenues for utilizing molecular metal clusters as building blocks for advanced nanomaterials.