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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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Coordination Compounds and Nomenclature02:54

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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Electron Configuration of Multielectron Atoms03:26

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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Plutonium and Cerium Perrhenate/Pertechnetate Coordination Polymers and Frameworks.

Mohammad Shohel1, A Kirstin Sockwell2, Amy E Hixon2

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This study reveals how technetium and rhenium complexes coordinate with plutonium and cerium, providing atomic-level insights into nuclear fuel reprocessing. Understanding these interactions is crucial for managing spent nuclear fuel and recovering valuable elements.

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Area of Science:

  • Coordination chemistry of actinides and lanthanides.
  • Materials science of extended solids.
  • Nuclear fuel reprocessing and waste management.

Background:

  • Spent nuclear fuel (SNF) contains valuable transuranic and lanthanide elements, but problematic fission products like technetium-99 (99TcO4-) hinder recovery.
  • Limited molecular-level understanding exists regarding the coordination chemistry of TcO4- or its surrogate, rhenium (ReO4-), with actinides and lanthanides.
  • 99TcO4- can coextract with high-valence metals during SNF reprocessing, complicating separation processes.

Purpose of the Study:

  • To investigate the coordination behavior of ReO4-/TcO4- with plutonium (Pu) and cerium (Ce) cations.
  • To characterize the resulting extended solids structurally and chemically.
  • To gain atomic-level insights into Pu-TcO4 coordination relevant to SNF reprocessing.

Main Methods:

  • Synthesis and structural elucidation of crystalline solids containing ReO4-/TcO4- and Pu/Ce.
  • Utilized X-ray diffraction and chemical characterization techniques.
  • Employed cerium (Ce) as a surrogate for trivalent lanthanides and for Pu in its trivalent and tetravalent oxidation states.

Main Results:

  • Seven crystalline solids were isolated, revealing ReO4-/TcO4- coordination with PuIV, PuVIO22+, CeIII, and CeIV.
  • Coordination modes included terminal and bridging, forming 1-, 2-, and 3-dimensional frameworks.
  • Specific structures included Pu(IV)-ReO4- 1D chains/2D frameworks, a unique PuVIO22+-ReO4- 1D chain, and CeIII-ReO4- 3D frameworks. A mixed-valence CeIII/IV-ReO4- 2D framework was also formed.

Conclusions:

  • The study provides the first reported crystal structures of Pu-ReO4 compounds, offering critical atomic-level data for Pu-TcO4 coordination in SNF reprocessing.
  • The coordination chemistry broadens understanding of bonding trends in early, high-valence actinides.
  • Highly acidic conditions and potential reduction of CeIV and TcVII presented challenges, with only one TcO4-containing structure isolated.