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Metal-Ligand Bonds02:51

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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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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

Complexation Equilibria: Factors Influencing Stability of Complexes

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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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Complexometric Titration: Ligands00:43

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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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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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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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Transition Metal Chain Complexes Supported by Soft Donor Assembling Ligands.

Pierre Braunstein1, Andreas A Danopoulos2

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This review explores discrete molecular chains of low-oxidation-state transition metals. It classifies these metal chains based on supporting ligands and their bonding interactions.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Review of discrete molecular chains featuring metals in low oxidation states.
  • Focus on systems with metal-metal proximity stabilized by bridging ligands with soft donor atoms.
  • Exclusion of single-atom bridged complexes and closed metal clusters.

Purpose of the Study:

  • To comprehensively review the chemistry of discrete molecular metal chains.
  • To introduce a novel classification system for these metal chains based on supporting ligands.
  • To compile and categorize transition metal-based systems and related complexes.

Main Methods:

  • Literature review of discrete molecular chains with metal-metal proximity.
  • Classification of supporting ligands based on donor atom type (neutral/anionic) and denticity.
  • Development of a ligand-based classification system using the number of ligand bridges ('bites') per metal-metal separation.

Main Results:

  • Detailed examination of transition metal-based molecular chains, with some inclusion of post-transition elements.
  • Identification of common supporting ligands, including N-heterocyclic carbenes, phosphines, ethers, thioethers, phenyl, ylides, silyl, phosphides, and thiolates.
  • Introduction of a classification scheme based on ligand 'bites', denticity, and donor atom position in the periodic table.

Conclusions:

  • The study provides a structured overview of discrete molecular metal chain chemistry.
  • A new classification system facilitates understanding and comparison of diverse metal chain structures.
  • A comprehensive compilation aids researchers in navigating this field of coordination chemistry.