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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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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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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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Effect of Lone Pairs of Electrons on Molecule Geometry
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Proton Diffusion in Orthorhombic Perovskite Sulfides.

Stefan Walder1, Aurelie Gueguen2, Denis Kramer1

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Proton mobility in perovskite sulfides was investigated using density functional theory. Zr-based compounds show promising room temperature diffusion coefficients, influenced by A- and B-site occupants affecting crystallography and anisotropy.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Proton mobility is crucial for applications like catalysis and energy storage.
  • Perovskite sulfides (ABS3) offer tunable properties for such applications.
  • Understanding proton diffusion mechanisms in these materials is essential.

Purpose of the Study:

  • To investigate proton mobility in a wide range of perovskite sulfides (ABS3).
  • To identify factors influencing proton diffusion rates and anisotropy.
  • To predict potential high-mobility materials for technological applications.

Main Methods:

  • Density Functional Theory (DFT) for analyzing hydrogen positions.
  • Nudged Elastic Band (NEB) method for calculating activation energy barriers.
  • Markovian master equation approach for diffusion rate calculations.

Main Results:

  • Identified metastable hydrogen positions and calculated activation energies.
  • Predicted room temperature diffusion coefficients up to 10^-6 cm^2/s in Zr-based compounds.
  • Demonstrated that A- and B-site occupants significantly impact proton mobility through crystallographic effects and anisotropy.

Conclusions:

  • Proton mobility in perovskite sulfides is highly dependent on structural and electronic properties.
  • Symmetry-breaking distortions that shorten S-S distances are key to reducing activation energies.
  • Zr-based perovskite sulfides are promising candidates for applications requiring high proton conductivity.