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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.0K
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,...
48.0K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.5K
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...
30.5K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.9K

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Cation Induced Structural Variation in Topochemically Modified Dion-Jacobson Perovskite Solid Solutions.

Roshni Bhuvan1, Gary J Sandrock1, Sara Akbarian-Tefaghi1

  • 1Department of Chemistry and the Advanced Materials Research Institute, The University of New Orleans, New Orleans, LA 70148, USA.

Molecules (Basel, Switzerland)
|November 27, 2025
PubMed
Summary

Researchers explored solid solutions in Dion-Jacobson layered perovskites by varying alkali metal cations. They found that cation size influences structure and thermal stability, enabling structural control in perovskite materials.

Keywords:
Dion-Jacobsonion exchangelayered perovskitessolid solutions

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Dion-Jacobson layered perovskites are ion-exchangeable materials with potential applications.
  • Understanding the relationship between composition and structure is crucial for material design.

Purpose of the Study:

  • To investigate the continuous solid solution series A1-xA'xLaNb2O7.
  • To elucidate the structure-composition relationship in these perovskites.
  • To explore the effect of alkali metal cation variation on structural and thermal properties.

Main Methods:

  • Topochemical synthesis of solid solutions by reacting end members (ALaNb2O7).
  • Characterization of solid solutions formed between various alkali metal combinations (Li, Na, K, Rb, Cs).
  • Thermal analysis of selected solid solutions.

Main Results:

  • Continuous solid solutions were formed for adjacent alkali metal pairs (Li/Na, Na/K, K/Rb, Rb/Cs).
  • A non-adjacent solid solution (K/Cs) was also successfully synthesized.
  • Cation coordination and layer alignments were found to be composition-dependent, dictated by the larger cation's concentration.
  • Compositions containing Li and Na exhibited thermal instability.

Conclusions:

  • Systematic variation of average cation sizes in the solid solution series allows for structural control.
  • These findings contribute to the understanding and design of perovskite materials for various applications.