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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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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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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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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Published on: July 21, 2011

Cationic rare-earth metal SALEN complexes.

Qiancai Liu1, Christian Meermann, Hans W Görlitzer

  • 1Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, D-85747, Garching, Germany.

Dalton Transactions (Cambridge, England : 2003)
|November 6, 2008
PubMed
Summary
This summary is machine-generated.

New yttrium and lanthanum complexes with silylamide ligands were synthesized and characterized. X-ray crystallography revealed unique structural features, including beta-agostic interactions and distinct coordination geometries in resulting ion pairs.

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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Published on: October 27, 2018

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
08:43

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

Published on: October 27, 2018

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Lanthanide Chemistry
  • Yttrium Chemistry

Background:

  • Synthesis and characterization of lanthanide and yttrium complexes are crucial for understanding their catalytic and material properties.
  • Silylamide ligands offer unique steric and electronic properties that can influence metal center coordination and reactivity.
  • The Salen-type ligand framework provides a robust platform for stabilizing various metal ions in different oxidation states.

Purpose of the Study:

  • To synthesize and characterize novel yttrium and lanthanum complexes featuring silylamide ligands and Salen-type frameworks.
  • To investigate the solid-state structural features of these complexes using X-ray crystallography.
  • To explore the reactivity of these complexes towards cationization and analyze the resulting ion pairs.

Main Methods:

  • Complexes (Salpren(tBu,tBu))Y[N(SiHMe2)2](thf) and (SALEN(tBu,tBu))La[N(SiHMe2)2](thf) were prepared from Ln[N(SiHMe2)2]3(thf)2 and H2SALEN(tBu,tBu).
  • X-ray crystallography was employed to determine the solid-state structures of the yttrium complex and the cationized ion pairs.
  • Reactions with ammonium tetraphenylborate were used to generate and isolate cationic metal complexes.

Main Results:

  • The yttrium complex exhibits an asymmetric coordination by the silylamide ligand with a significant Y---(HSi) beta-agostic interaction.
  • The metal center in the yttrium complex is displaced from the [N2O2] plane of the bent Salpren(tBu,tBu) ligand.
  • Cationization with ammonium tetraphenylborate yielded ion pairs with diverse coordination geometries (octahedral and pentagonal-bipyramidal) for Sc, Y, and La.

Conclusions:

  • The study successfully synthesized and structurally characterized novel yttrium and lanthanum silylamide complexes.
  • The findings highlight the influence of the silylamide ligand on the coordination environment and solid-state structure.
  • The formation of cationic species demonstrates the versatility of these complexes in generating diverse coordination geometries.