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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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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Bridging (Thionylimido)metal Complexes.

Liam J R McGeachie1, Michael Bühl1, David B Cordes1

  • 1EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom.

Inorganic Chemistry
|May 27, 2021
PubMed
Summary
This summary is machine-generated.

Researchers have discovered the thionylimido ligand bridging two transition-metal centers for the first time. This finding enables the creation of novel bimetallic and tetrametallic systems using Cp2Ti(NSO)2.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Synthesis

Background:

  • The thionylimido ligand (NSO) is a versatile inorganic moiety.
  • Bridging ligands play a crucial role in constructing polynuclear metal complexes.

Purpose of the Study:

  • To report the first instances of the thionylimido ligand acting as a μ2-bridging ligand.
  • To synthesize and characterize bimetallic and tetrametallic systems featuring this bridging mode.

Main Methods:

  • Synthesis of Cp2Ti(NSO)2 precursor.
  • Reactions with transition-metal sources to form polynuclear complexes.
  • Characterization using spectroscopic and analytical techniques.

Main Results:

  • Successful demonstration of the thionylimido ligand as a μ2-bridging ligand between two transition-metal centers.
  • Formation of discrete bimetallic and tetrametallic complexes.
  • Structural characterization of the novel multinuclear systems.

Conclusions:

  • The thionylimido ligand can effectively bridge two transition-metal centers.
  • This work expands the known coordination chemistry of thionylimido ligands.
  • Opens new avenues for designing polynuclear transition-metal complexes.