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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

15.4K
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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Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

8.8K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
8.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.1K
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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Alkyl Halides02:45

Alkyl Halides

17.6K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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Tolerance Factor for Stabilizing 3D Hybrid Halide Perovskitoids Using Linear Diammonium Cations.

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Researchers developed new 3D halide perovskitoids using large organic cations, expanding material design beyond traditional limits. These novel compounds offer tunable optoelectronic properties for future applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Three-dimensional (3D) halide perovskites are crucial for optoelectronics but are limited by cation size constraints (Goldschmidt tolerance factor).
  • Accommodating larger cations typically leads to lower-dimensional structures, deviating from desired 3D networks.

Purpose of the Study:

  • To synthesize and characterize new 3D bromide perovskitoids (A'Pb2Br6) with large, linear organic diammonium cations.
  • To establish a guiding principle for expanding the library of these 3D perovskitoids.
  • To investigate their structural, electronic, and optical properties for optoelectronic applications.

Main Methods:

  • Crystallographic analysis to determine the structures of four new A'Pb2Br6 compounds.
  • Electronic structure calculations to analyze band gaps and dispersions.
  • Photoluminescence spectroscopy to study optical properties at room temperature.

Main Results:

  • Discovery of four new 3D bromide perovskitoids (A'Pb2Br6) accommodating large organic cations.
  • Identification of a new structural motif based on edge-shared octahedra linked by corner-sharing.
  • Demonstration of direct bandgap semiconducting behavior with significant band dispersion.
  • Correlation between structural distortions (Pb-Br-Pb angles, octahedra distortion) and broad room-temperature photoluminescence.

Conclusions:

  • The new A'Pb2Br6 compounds represent a significant expansion of 3D halide perovskitoid chemistry.
  • A new design rule, analogous to the Goldschmidt tolerance factor, is proposed for this class of materials.
  • These 3D perovskitoids exhibit promising optoelectronic properties, comparable to traditional perovskites, paving the way for novel device applications.