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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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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.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Different Metallophilic Attitudes Revealed by Compression.

Stefano Racioppi1,2, Michał Andrzejewski1, Valentina Colombo2

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Inorganic Chemistry
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This summary is machine-generated.

Compression studies reveal distinct behaviors in coinage metal coordination polymers. Silver(I) compounds exhibit argentophilic interactions under pressure, while copper(I) compounds show no such metallophilic interactions.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Chemistry

Background:

  • Coordination polymers with coinage metal(I) cations are synthesized to investigate interchain interactions.
  • Metallophilic interactions and metal coordination expansion are potential outcomes of applied pressure.

Purpose of the Study:

  • To explore the impact of compression on isostructural coordination polymers containing silver(I) and copper(I).
  • To understand the differences in metallophilic interactions between Ag(I) and Cu(I) under pressure.

Main Methods:

  • High-pressure X-ray diffraction studies.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • Silver(I) coordination polymers display enhanced argentophilic interactions upon mild compression, with Ag-Ag distances reaching those of metallic silver at 7.94 GPa.
  • Copper(I) coordination polymers do not activate cuprophilic interactions even under compression up to 8 GPa, with Cu-Cu distances remaining non-bonding.

Conclusions:

  • Homologous Ag(I) and Cu(I) coordination polymers exhibit fundamentally different responses to compression.
  • The propensity for metallophilic interactions varies significantly between silver and copper in these materials.