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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
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Transformation of Plane Stress01:18

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Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
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Components of Stress01:23

Components of Stress

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Stress analysis under multiple loading conditions is intricate, necessitating a comprehensive grasp of normal and shearing stresses. Consider a small cube at point O, subjected to stress on all six faces, visible or not. Normal stress components σx, σy, σz act perpendicularly to the x, y, and z axes. Shearing stress components τxy and τxz are exerted on faces perpendicular to these axes.
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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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Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

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Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Structural stability of CuAl2O4under pressure.

P A Agzamova1,2, A A Belik3, S V Streltsov1,2

  • 1M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Ekaterinburg, Russia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 27, 2020
PubMed
Summary
This summary is machine-generated.

Copper aluminum oxide (CuAl2O4) shows unusual structural instability under high pressure, decomposing into copper oxide (CuO) and aluminum oxide (Al2O3) around 6 GPa. This instability is linked to the compressibility of distorted CuO phases.

Keywords:
high pressurespinelsspin–orbit-coupling

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Computational Chemistry

Background:

  • Investigating the structural properties of CuAl2O4, a material exhibiting potential Jahn-Teller distortion suppression via spin-orbit coupling.
  • Understanding the behavior of complex oxides under extreme conditions is crucial for materials design.

Purpose of the Study:

  • To investigate the structural stability of CuAl2O4 under high pressure.
  • To elucidate the mechanisms behind any observed structural phase transitions or instabilities.

Main Methods:

  • Experimental: X-ray powder diffraction up to 6 GPa.
  • Computational: Density-functional theory (DFT) with +U and spin-orbit coupling (SOC) calculations.

Main Results:

  • CuAl2O4 was found to be unstable at approximately 6 GPa and 1000 K, decomposing into CuO and Al2O3.
  • Computational analysis revealed that the compressibility of Jahn-Teller distorted CuO contributes significantly to this instability.

Conclusions:

  • High pressure induces a phase decomposition in CuAl2O4.
  • The interplay between Jahn-Teller distortions, spin-orbit coupling, and material compressibility governs the stability of CuAl2O4 under pressure.