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Related Concept Videos

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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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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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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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates01:21

Equations of Motion: Rectangular Coordinates and Cylindrical Coordinates

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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
When a particle moves relative to an inertial frame, the equations of motion can be expressed using rectangular components. If the motion is confined to the x-y plane, the equations having the x and y coordinates only can be used to simplify the mathematical representation.
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Spherical Coordinates01:23

Spherical Coordinates

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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Krypton/Xenon separation at room temperature in a flexible coordinative framework sorbent.

Siqi Dong1, Bochun Zhang2, Mohammad Wahiduzzaman3

  • 1Institute of Nuclear Physics and Chemistry (INPC), China Academy of Engineering Physics (CAEP), Mianyang, China.

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A novel metal-organic framework enables efficient krypton separation from xenon at room temperature. This breakthrough offers an energy-saving alternative to cryogenic methods for noble gas purification.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Xenon-krypton separation is crucial for high-tech, defense, and aerospace applications.
  • Current cryogenic separation methods are energy-intensive.
  • Existing adsorbents face challenges with desorption energy penalties, hindering practical xenon purification.

Purpose of the Study:

  • To develop an energy-efficient adsorbent for noble gas separation.
  • To reverse the conventional selectivity for preferential krypton adsorption.
  • To overcome the limitations of existing adsorbents in practical xenon purification.

Main Methods:

  • Design and synthesis of a metal-organic framework with synergistic structural and local flexibility.
  • Adsorptive separation experiments at room temperature and 1 bar.
  • Breakthrough experiments using Kr/Xe mixtures to determine selectivity.
  • Mechanistic studies involving dynamic cavity window adjustments and ligand vibrations.

Main Results:

  • The metal-organic framework demonstrates preferential krypton adsorption at room temperature.
  • Achieved a krypton uptake of 36.8 cm³ cm⁻³ and a Kr/Xe selectivity of 10.4.
  • Successfully captured trace krypton (40 ppm) and exhibited commendable radioactive stability.
  • Mechanistic studies revealed kinetically controlled sieving via dynamic channel expansion.

Conclusions:

  • The developed material offers an energy-efficient approach to krypton-centric separation.
  • This research redefines the design paradigm for noble gas purification.
  • The adaptive host-guest interactions provide a new strategy for separating dynamically matched molecules.