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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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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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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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Color in Coordination Complexes
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Tetrahedral 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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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Capturing the missing [AgF2](-) anion within an Ru2(III/III) dimeric dumbbell complex.

Amanda R Corcos1, John F Berry

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, USA. berry@chem.wisc.edu.

Dalton Transactions (Cambridge, England : 2003)
|January 12, 2016
PubMed
Summary

A novel difluoride anion complex, {[Ru2(ap)4]2[AgF2]}[BF4]3, was synthesized and characterized. This unique structure features a ligated coinage metal difluoride anion, offering new insights into metal-metal bonded complexes.

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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Dimeric ruthenium complexes with metal-metal bonds are known for their unique electronic and structural properties.
  • Coinage metal anions, particularly dihalo species, are less explored in ligated forms.
  • Understanding the interplay between metal cores and ligated anions is crucial for designing new functional materials.

Purpose of the Study:

  • To synthesize and characterize a novel complex containing a ligated coinage metal difluoride anion.
  • To investigate the structural and electronic properties of the {[Ru2(ap)4]2[AgF2]}[BF4]3 complex.
  • To compare this complex with existing dimeric and monomeric ruthenium structures and other dihalo coinage-metalate anions.

Main Methods:

  • Synthesis and characterization of the target complex.
  • X-ray crystallography to determine precise structural parameters (Ru-Ru, Ru-F, Ag-F bond distances).
  • Cyclic voltammetry to study the electrochemical behavior in solution.

Main Results:

  • The complex {[Ru2(ap)4]2[AgF2]}[BF4]3 was successfully prepared and characterized.
  • X-ray crystallography revealed short Ru-Ru (2.2835(3) Å) and Ru-F (2.054(1) Å) distances, and a longer Ag-F (2.274(1) Å) distance.
  • Cyclic voltammetry showed partial dissociation in solution but a stable two-electron redox feature for the dimeric Ru2 core.

Conclusions:

  • This study reports the first example of a ligated coinage metal difluoride anion.
  • The complex exhibits unique structural features with short metal-metal and metal-ligand bonds.
  • The electrochemical behavior indicates a stable dimeric core with potential for further redox studies.