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Related Concept Videos

Metallic Solids02:37

Metallic Solids

21.3K
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....
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Valence Bond Theory02:42

Valence Bond Theory

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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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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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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...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

2.0K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
2.0K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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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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Two-dimensional Pd-C bonded organometallic framework with dynamic packing transformations.

Jong-Yeong Jung1, Jaewook Kim1,2, Jintaek Gong3

  • 1Department of Chemistry, Korea Advanced Institute of Science and Technology 291, Daehak-ro, Yuseong-gu Daejeon 34141 Republic of Korea hee-seung_lee@kaist.ac.kr hsong@kaist.ac.kr.

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|March 16, 2026
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Summary

Researchers developed a novel two-dimensional organometallic framework, PdOF-1, using direct palladium-carbon bonds. This breakthrough expands metal-organic framework (MOF) design by enabling persistent covalent linkages and tunable structural adaptability.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Supramolecular Chemistry

Background:

  • Traditional metal-organic frameworks (MOFs) rely on metal-oxygen or metal-nitrogen bonds, limiting the use of softer metals due to the hard-soft acid-base principle.
  • Metal-carbon linkages in MOFs are challenging due to limited reversibility and ligand scarcity, hindering the incorporation of soft metals like palladium.

Purpose of the Study:

  • To synthesize a novel two-dimensional organometallic framework (MOF) utilizing direct metal-carbon bonds.
  • To explore the stabilization of soft metal centers using covalent linkages within a framework structure.
  • To investigate the structural adaptability and transformations of the newly synthesized MOF.

Main Methods:

  • Synthesis of a 2D organometallic framework (PdOF-1) via a one-pot, carboxylate-directed ortho C-H activation process.
  • Utilized terephthalate (bdc^2-) as the organic ligand to stabilize soft palladium centers through direct palladium-carbon (Pd-C) bonds.
  • Characterization using single-crystal X-ray diffraction, alongside comprehensive structural and spectroscopic analyses.

Main Results:

  • Successfully synthesized PdOF-1, a 2D framework with direct Pd-C bonds, stabilizing soft palladium centers and preventing agglomeration.
  • Revealed a zigzag 2D lattice with ordered stacking and square-planar Pd coordination via single-crystal X-ray diffraction.
  • Observed two-step solid-state structural transformations (layer shearing and compression) upon DMSO removal and further transformations with coordinating solvents.

Conclusions:

  • Established a new synthetic strategy combining organometallic chemistry and reticular design for MOF synthesis.
  • Expanded the chemical space of MOFs to include frameworks with persistent covalent metal-carbon linkages.
  • Demonstrated tunable structural adaptability in the synthesized PdOF-1, opening avenues for new material applications.