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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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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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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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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Well defined difluorogold(iii) complexes supported by N-ligands.

Mohammad Albayer1, Robert Corbo1, Jason L Dutton1

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Researchers developed simple methods to create stable difluorogold(III) complexes. These new gold-fluoride compounds feature the shortest gold-fluorine bond ever recorded, advancing inorganic chemistry.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry

Background:

  • Gold complexes are valuable in catalysis and medicine.
  • Synthesis of stable gold(III) fluoride complexes remains challenging.

Purpose of the Study:

  • To develop facile synthetic routes for stable difluorogold(III) complexes.
  • To characterize the structural properties of novel gold-fluoride compounds.

Main Methods:

  • Oxidation of N-ligated cationic gold(I) precursors using xenon difluoride (XeF2).
  • Fluoride displacement from tricationic gold(III) precursors using potassium fluoride (KF).
  • X-ray crystallography for structural determination.

Main Results:

  • Successful synthesis of stable difluorogold(III) complexes via two distinct methods.
  • Identification of a bisimidazole ligated gold(III) complex.
  • Determination of the shortest gold-fluorine (Au-F) bond length in a gold complex through crystallographic analysis.

Conclusions:

  • The developed methods provide accessible routes to stable difluorogold(III) complexes.
  • The unprecedentedly short Au-F bond suggests unique electronic properties and potential reactivity.
  • These findings expand the scope of gold coordination chemistry and fluoride chemistry.