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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

8.5K
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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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.
CFT focuses on...
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Related Experiment Video

Updated: Jun 26, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Uranyl-Tc(VII)/Tc(V) hybrid clusters.

Mohammad Shohel1, May Nyman1

  • 1Department of Chemistry, Oregon State University, Corvallis, OR-97331, USA. may.nyman@oregonstate.edu.

Chemical Communications (Cambridge, England)
|May 15, 2024
PubMed
Summary

This study reveals new molecular structures where technetium (Tc) and uranium coexist, crucial for understanding nuclear waste disposal and reprocessing. The findings highlight technetium

Area of Science:

  • Nuclear Chemistry
  • Materials Science
  • Radiochemistry

Background:

  • Pertechnetate (TcO4-), reduced technetium species, and actinides are present in spent nuclear fuel and legacy wastes.
  • Understanding the co-speciation and co-transport of these elements is vital for nuclear fuel reprocessing and waste disposal.

Purpose of the Study:

  • To synthesize and characterize novel molecular cluster and framework structures incorporating technetium and uranyl units.
  • To investigate the co-speciation behavior of technetium oxoanions and reduced technetium species with uranyl building blocks.

Main Methods:

  • Crystallographic analysis of five new molecular cluster/framework structures.
  • Synthesis involving pentameric and tetrameric uranyl building units.
  • Decoration with TcO4-/ReO4- oxoanions and fusion with reduced technetyl cation Tc(V)O.

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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Main Results:

  • Discovery of five new molecular cluster/framework structures.
  • Structures feature uranyl building units decorated by TcO4-/ReO4- or fused with Tc(V)O.
  • Observation of technetium auto-reduction to Tc(V)O without external reducing agents, indicating emergent polyoxometalate-like behavior.

Conclusions:

  • The study provides new insights into the structural chemistry of technetium-uranium co-speciation.
  • The observed auto-reduction of technetium expands the understanding of its reduction pathways and polyoxometalate chemistry.
  • These findings are critical for predicting and managing the behavior of nuclear waste components.