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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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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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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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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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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Employing Lewis Acidity to Generate Bimetallic Lanthanide Complexes.

Bonnie E Klamm1,2, Thomas E Albrecht-Schmitt2, Ryan E Baumbach3

  • 1Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87544, United States.

Inorganic Chemistry
|July 7, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized bimetallic lanthanide complexes using a novel imine/hemiacetalate framework. Reactivity varies with lanthanide size, leading to selective formation of bimetallic complexes with heavier elements.

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Area of Science:

  • Coordination Chemistry
  • Lanthanide Chemistry
  • Organometallic Chemistry

Background:

  • Advancing fundamental understanding of 4f-element chelation chemistry is crucial for lanthanide-based technologies.
  • The synthesis of novel lanthanide complexes requires exploration of new ligand frameworks.
  • Imine/hemiacetalate frameworks offer unique coordination environments for metal ions.

Purpose of the Study:

  • To synthesize and characterize bimetallic 4f-element complexes within an imine/hemiacetalate framework.
  • To investigate the reactivity of a cage ligand with lanthanide ions, leading to imine cleavage.
  • To explore the influence of lanthanide ionic radius on complex formation and reactivity.

Main Methods:

  • Synthesis of bimetallic lanthanide complexes (LnTPT) from a cage ligand (TPT).
  • Hydrolysis and methanolysis reactions of the tris(pyridinediimine)bis(Tren) ligand.
  • Characterization of the resulting lanthanide complexes using spectroscopic and analytical techniques.

Main Results:

  • Bimetallic lanthanide complexes, LnTPT, were successfully synthesized within an imine/hemiacetalate framework.
  • Imine cleavage of the cage ligand was observed, generating distinct metal binding sites.
  • Lanthanide ionic radius influenced reactivity, with heavier lanthanides exclusively forming bimetallic complexes.
  • Cleavage reactivity was extended to other primary alcohols beyond methanol.

Conclusions:

  • The study established a new route to bimetallic lanthanide complexes with tunable reactivity.
  • The findings highlight the importance of lanthanide size in dictating coordination chemistry and ligand modification.
  • This work contributes to the fundamental understanding of 4f-element chelation and opens avenues for new lanthanide material development.