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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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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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Updated: Jul 11, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Triphenylphosphine─Closed-Shell Metal Cation Interactions.

Damian P Duda1, David A Dixon1

  • 1Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States.

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|November 15, 2023
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Summary
This summary is machine-generated.

Group 1 and 2 cations interact with triphenylphosphine

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Chemical Physics

Background:

  • Triphenylphosphine is a versatile ligand in coordination chemistry.
  • Understanding cation-ligand interactions is crucial for catalysis and materials science.

Purpose of the Study:

  • To investigate binding modes and energies of group 1 and 11 monocations and group 2 dications with triphenylphosphine.
  • To analyze cation-π interactions and substituent effects.

Main Methods:

  • Correlated molecular orbital theory
  • Density functional theory (DFT)

Main Results:

  • Two binding modes identified: phosphorus lone pair and phenyl rings.
  • Group 1 and 2 cations favor π-system binding, correlating with ionic radii and hardness.
  • Group 11 monocations prefer lone pair binding, correlating with cation hardness.

Conclusions:

  • Cation-π interactions are significant in triphenylphosphine complexes.
  • Ionic properties dictate binding preferences and strengths.
  • Computational methods provide reliable data for cation-ligand interactions.