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Related Concept Videos

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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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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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Related Experiment Video

Updated: Aug 23, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Tunable interstitial anionic electrons in layered MXenes.

Bowen Li1, Haoyun Bai1, Shiying Shen1

  • 1Institute of Applied Physics and Materials Engineering, University of Macau, Macao SAR 999078, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 2, 2022
PubMed
Summary
This summary is machine-generated.

Researchers discovered new layered electrides, M2X, with tunable interstitial electrons originating from transition metal d-electrons. These materials offer potential for advanced electron injection, emission, and high-speed electronic devices.

Keywords:
MXeneselectridelayeredstacking

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Quantum Chemistry

Background:

  • Electrides, materials featuring electrons as anions in interstitial sites, possess unique electronic properties.
  • These properties enable applications in electron emission and high-speed electronic devices.

Purpose of the Study:

  • To report a new class of layered electrides, M2X (M = Ti, V, Cr; X = C, N).
  • To investigate the electronic structure and properties of these novel materials.
  • To explore the tunability of interstitial electrons and their origins.

Main Methods:

  • Computational materials science approaches.
  • Density Functional Theory (DFT) calculations.
  • Analysis of electronic band structure and charge density distribution.

Main Results:

  • Identification of layered M2X compounds exhibiting interstitial electrons in interlayer spacings.
  • Demonstration of electron delocalization trends from Ti-based to Cr-based structures.
  • Attribution of interstitial electrons to the d-electrons of transition metals.
  • Observation of tunable electronic properties in these layered MXenes.

Conclusions:

  • The study confirms the existence of tunable interstitial electrons in layered MXenes.
  • These findings provide insights into designing new materials with diverse electronic applications.
  • The discovered electrides hold promise for advanced electron injection/emission and high-speed devices.