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Valence Bond Theory02:42

Valence Bond Theory

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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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Metal-Ligand Bonds02:51

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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Dicyanoaurate-based heterobimetallic uranyl coordination polymers.

Matthew L Brown1, Jeffrey S Ovens, Daniel B Leznoff

  • 1Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, B.C., Canada. dleznoff@sfu.ca.

Dalton Transactions (Cambridge, England : 2003)
|May 17, 2017
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Summary

This study synthesizes novel uranyl-dicyanoaurate coordination polymers and molecular complexes. The research explores structural diversity and the role of aurophilic interactions in these new materials.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Uranyl ions (UO2^2+) are key components in various functional materials.
  • Dicyanoaurate (Au(CN)2^-) ligands are known to form interesting supramolecular structures.
  • The combination of these ions offers potential for novel coordination polymers and complexes.

Purpose of the Study:

  • To synthesize and characterize the first series of uranyl-dicyanoaurate coordination polymers and molecular complexes.
  • To investigate the structural diversity and influence of reaction conditions on the resulting materials.
  • To explore the presence and impact of aurophilic interactions in these systems.

Main Methods:

  • Solvent-based reactions of uranyl nitrate with [A][Au(CN)2] (A = [nBu4N]+ or [PPN]+).
  • Variations in solvents (alcoholic vs. non-alcoholic) and additives (bipyridines, terpyridine).
  • Characterization techniques including structural analysis and emission spectroscopy.

Main Results:

  • Synthesis of diverse one-dimensional coordination polymers and molecular complexes.
  • Identification of a uranyl-peroxo ladder topology incorporating aurophilic interactions.
  • Observation of structural differences based on solvent choice and ligand incorporation, with varying degrees of aurophilic interactions.
  • Emission spectra linked to aurophilic interactions in specific compounds.

Conclusions:

  • The study successfully established a synthetic route to novel uranyl-dicyanoaurate materials.
  • Reaction conditions and ligand choice significantly influence the resulting structures and properties.
  • Aurophilic interactions play a role in the observed structures and luminescence in certain uranyl-dicyanoaurate complexes.