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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

14.0K
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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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. 
41.0K
Metallic Solids02:37

Metallic Solids

18.1K
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....
18.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.2K
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,...
41.2K
Valence Bond Theory02:42

Valence Bond Theory

8.4K
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...
8.4K
Colors and Magnetism03:02

Colors and Magnetism

11.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Temperature-Dependent Mixed Valency in the Hexagonal Perovskite Cs3NaFe2Cl9.

David Liu1, Alexander Milder1, Jeremiah Stevens1

  • 1Department of Chemistry and Biochemistry, The Ohio State University, 100 W. 18th Avenue, Columbus, Ohio 43210, United States.

Journal of the American Chemical Society
|February 20, 2025
PubMed
Summary

Two novel hexagonal perovskites, Cs₃NaFe₂Cl₉ and Cs₃NaMnFeCl₉, exhibit unique magnetic and electronic properties due to their bioctahedral structures. Their distinct magnetic couplings and charge transfer excitations were detailed.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Magnetism

Background:

  • Hexagonal perovskites are a class of materials with diverse structural and electronic properties.
  • Understanding the interplay between structure, electronic transitions, and magnetic coupling is crucial for designing new functional materials.
  • The 6H perovskite structure, characterized by bioctahedral clusters, offers unique possibilities for transition metal ion arrangements.

Purpose of the Study:

  • To synthesize and characterize two new hexagonal perovskites: Cs₃NaFe₂Cl₉ and Cs₃NaMnFeCl₉.
  • To investigate their structural, optical, and magnetic properties.
  • To elucidate the nature of electronic and magnetic interactions within these novel compounds.

Main Methods:

  • Synthesis of hexagonal perovskite compounds.
  • Structural analysis using X-ray diffraction (implied by structure determination).
  • Optical characterization via diffuse reflectance spectroscopy.
  • Magnetic susceptibility measurements.
  • Mössbauer spectroscopy for detailed electronic state analysis.

Main Results:

  • Both compounds crystallize in the 6H hexagonal perovskite structure (P6₃/mmc) featuring Fe₂Cl₉⁴⁻ and FeMnCl₉⁴⁻ bioctahedra.
  • Diffuse reflectance spectroscopy identified metal-to-metal and intervalence charge transfer excitations.
  • Cs₃NaFe₂Cl₉ exhibits ferromagnetic coupling (θ_CW = 16.7 K) due to rapid electron exchange within Fe dimers.
  • Cs₃NaMnFeCl₉ shows antiferromagnetic coupling between Fe³⁺ and Mn²⁺ (θ_CW = -41.4 K).
  • Mössbauer spectroscopy revealed dynamic electron exchange (Fe²⁺.⁵⁺) at 100 K, slowing to distinct Fe²⁺ and Fe³⁺ signals upon cooling.

Conclusions:

  • The synthesized hexagonal perovskites possess unique bioctahedral arrangements influencing their electronic and magnetic behaviors.
  • The observed magnetic couplings (ferromagnetic and antiferromagnetic) are directly linked to the specific transition metal ions and their electronic states.
  • Dynamic electron exchange phenomena were clearly demonstrated, providing insights into charge transport mechanisms in these materials.