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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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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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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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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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EDTA: Chemistry and Properties01:22

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Hydroxamate-Based Metal-Organic Frameworks.

Koh Sugamata1

  • 1Department of Chemistry, College of Science, Rikkyo University, 3-34-1, Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 10, 2024
PubMed
Summary
This summary is machine-generated.

Hydroxamate-based metal-organic frameworks (MOFs) offer unique structures and functionalities distinct from carboxylate MOFs. This review explores their synthesis, structure, and applications, highlighting the hydroxamate ligand's impact.

Keywords:
coordination polymershydroxamatehydroxamic acidmetal-organic frameworksmetal-organic polyhedra

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Coordination Chemistry

Background:

  • Metal-organic frameworks (MOFs) are crystalline porous materials constructed from metal ions and organic linkers.
  • Carboxylate-based MOFs are extensively studied, but alternative linker chemistries offer new possibilities.
  • Hydroxamates represent a promising class of ligands for MOF construction.

Purpose of the Study:

  • To review recent advancements in hydroxamate-based MOFs.
  • To compare the structural and functional properties of hydroxamate MOFs with their carboxylate counterparts.
  • To highlight the unique attributes conferred by the hydroxamate ligand.

Main Methods:

  • Literature review of synthetic strategies for hydroxamate-based MOFs.
  • Analysis of structural characteristics reported for these novel MOFs.
  • Survey of functional applications and property comparisons.

Main Results:

  • Hydroxamates form MOFs with distinct structural motifs and functionalities compared to carboxylates.
  • Specific examples showcase diverse architectures and tunable properties.
  • The hydroxamate ligand influences MOF properties, offering unique advantages.

Conclusions:

  • Hydroxamate-based MOFs are an emerging class of materials with significant potential.
  • Their unique structural and chemical features enable novel applications.
  • Further research into hydroxamate MOFs is warranted to explore their full capabilities.