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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

8.8K
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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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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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...
57.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
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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Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.0K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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Related Experiment Video

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Three-dimensional valency mapping in ceria nanocrystals.

Bart Goris1, Stuart Turner, Sara Bals

  • 1EMAT, University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium.

ACS Nano
|October 7, 2014
PubMed
Summary
This summary is machine-generated.

Electron tomography and electron energy loss spectroscopy reveal facet-dependent cerium ion reduction in ceria nanocrystals. This technique enables 3D mapping of material properties for advanced nanomaterial design.

Keywords:
EELScatalysisceriaredoxtomography

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Ceria (CeO2-x) nanocrystals are crucial in catalysis and energy applications.
  • Understanding surface properties and ion valency is key to optimizing ceria performance.
  • Previous methods lacked 3D resolution for surface valency mapping.

Purpose of the Study:

  • To develop and apply a 3D mapping technique for cerium ion valency in ceria nanocrystals.
  • To investigate the facet-dependent surface reduction of ceria nanoparticles.
  • To demonstrate the capability of the technique for analyzing nanomaterial properties.

Main Methods:

  • Combined electron tomography with electron energy loss spectroscopy (EELS).
  • Reconstructed a 3D data cube with EELS spectra in each voxel.
  • Analyzed valency of cerium (Ce) ions in CeO2-x nanocrystals.

Main Results:

  • Successfully mapped Ce ion valency in 3D within ceria nanocrystals.
  • Observed a distinct facet-dependent reduction shell at the nanoparticle surface.
  • {111} facets showed low surface reduction, while {001} facets exhibited greater reduction.
  • Demonstrated a larger surface shell of reduced cerium ions at {001} facets.

Conclusions:

  • The developed tomographic EELS technique provides unprecedented 3D insight into nanomaterial properties.
  • Facet orientation significantly influences the surface reduction of ceria nanoparticles.
  • This approach can guide the synthesis of advanced nanomaterials with tailored properties.