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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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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 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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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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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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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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Coinage Metal Bis(trifluoromethyl)amido Complexes.

Leon N Schneider1, Erik R Csapo1, Tanja Knuplez1

  • 1Julius Maximilian University Würzburg, Institute of Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Am Hubland, Würzburg 97074, Germany.

Inorganic Chemistry
|February 19, 2026
PubMed
Summary

New bis(trifluoromethyl)amido coinage metal complexes, including N-heterocyclic carbene (NHC) copper, silver, and gold compounds, exhibit thermal robustness. These complexes offer insights into the electronic properties of the bis(trifluoromethyl)amido ligand.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Coinage metals (Cu, Ag, Au) are vital in catalysis and materials.
  • N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
  • Fluorinated ligands can impart unique electronic and steric properties to metal complexes.

Purpose of the Study:

  • To synthesize and characterize novel bis(trifluoromethyl)amido coinage metal(I) complexes.
  • To investigate the structural and electronic properties of the bis(trifluoromethyl)amido ligand.
  • To explore the thermal stability and bonding characteristics of these new complexes.

Main Methods:

  • Synthesis of metal(I) complexes with bis(trifluoromethyl)amido ligands.
  • Characterization using spectroscopic methods (NMR, IR, etc.) and elemental analysis.
  • Structural determination via single-crystal X-ray diffraction (SCXRD).
  • Computational studies including Density Functional Theory (DFT) and ETS-NOCV analysis.

Main Results:

  • Successful synthesis of bis(trifluoromethyl)amido complexes of Cu(I), Ag(I), and Au(I) with NHC and phosphine ligands.
  • Complexes display high thermal stability (decomposition up to 259 °C).
  • SCXRD studies reveal detailed structural parameters.
  • DFT and ETS-NOCV analyses indicate the bis(trifluoromethyl)amido ligand is a weaker sigma-donor compared to non-fluorinated analogues.

Conclusions:

  • The bis(trifluoromethyl)amido ligand's electronic properties were elucidated, showing reduced sigma-donating ability.
  • The synthesized coinage metal complexes are thermally robust and structurally well-defined.
  • This work expands the library of fluorinated organometallic compounds with potential applications.