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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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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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Using remote substituents to control solution structure and anion binding in lanthanide complexes.

Manuel Tropiano1, Octavia A Blackburn, James A Tilney

  • 1Chemical Research Laboratory, Oxford University, 12 Mansfield Road, Oxford OX1 3TA (UK).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 9, 2013
PubMed
Summary

Subtle changes in lanthanide complex structure, far from the binding site, significantly alter anion affinity. This study reveals how remote substituents control molecular conformation and binding properties.

Keywords:
anionsconformational spacelanthanidesluminescenceremote effects

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Lanthanide Chemistry

Background:

  • Lanthanide complexes are investigated for anion binding.
  • Structurally similar complexes exhibit varying anion affinities.
  • Peripheral molecular modifications can influence binding pocket interactions.

Purpose of the Study:

  • To explore how remote substituents affect anion-binding properties of lanthanide complexes.
  • To elucidate the relationship between molecular conformation and anion affinity.
  • To understand the impact of peripheral structural changes on binding constants.

Main Methods:

  • Synthesis of three structurally related lanthanide complexes.
  • Characterization of anion-binding properties, specifically affinity for isophthalate.
  • Analysis of conformational flexibility and substituent effects using structural insights.

Main Results:

  • Dramatic differences in anion affinity were observed among the related lanthanide complexes.
  • Remote substituent changes significantly altered the binding constant for isophthalate.
  • Increased steric bulk remote from the binding site enhanced binding constant by restricting conformational mobility.

Conclusions:

  • Remote substituents exert significant control over the global structure and conformational space of lanthanide complexes.
  • Peripheral modifications can be strategically employed to tune anion-binding affinities.
  • Understanding conformational control is key to designing selective anion receptors.