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Related Concept Videos

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...
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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.
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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.
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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.
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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
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Related Experiment Video

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Fabrication of Ti3C2 MXene Microelectrode Arrays for In Vivo Neural Recording
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Structure of nanocrystalline Ti3C2 MXene using atomic pair distribution function.

Chenyang Shi1, Majid Beidaghi2, Michael Naguib2

  • 1Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.

Physical Review Letters
|April 15, 2014
PubMed
Summary
This summary is machine-generated.

The structure of two-dimensional titanium carbide (Ti3C2) MXene materials was analyzed. Intercalating potassium or sodium ions altered the material

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Area of Science:

  • Materials Science: Investigating novel two-dimensional materials.
  • Crystallography: Analyzing atomic structures and lattice parameters.

Background:

  • Two-dimensional materials like titanium carbide (Ti3C2) MXenes offer unique properties.
  • Understanding their structural behavior upon ion intercalation is crucial for applications.

Purpose of the Study:

  • To determine the structural changes in Ti3C2 MXenes after potassium hydroxide and sodium acetate intercalation.
  • To elucidate the effects of ion intercalation on the lattice parameters of Ti3C2 MXenes.

Main Methods:

  • Utilized the x-ray atomic pair distribution function (PDF) technique.
  • Analyzed nanocrystalline pristine, K+-intercalated, and Na+-intercalated Ti3C2 MXenes.

Main Results:

  • Pristine Ti3C2 MXene exhibits a hexagonal structure (a=b=3.0505(5) Å, c=19.86(2) Å) with hydroxyl and fluoride terminations.
  • Intercalation of K+ or Na+ ions expanded the interlayer spacing (perpendicular to the planes).
  • In-plane lattice parameters (a and b) decreased upon K+ or Na+ ion intercalation.

Conclusions:

  • Ion intercalation significantly modifies the Ti3C2 MXene crystal structure.
  • The observed structural changes provide insights into MXene material behavior and potential tuning for specific uses.