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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 - 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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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Effect of [n]-Helicene Length on Crystal Packing.

Julia A Schmidt1, Emma H Wolpert1, Grace M Sparrow2

  • 1Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.

Crystal Growth & Design
|December 11, 2023
PubMed
Summary

Chiral organic molecules offer unique electronic properties, but their performance depends on molecular packing. Crystal structure prediction reveals how helicene length influences packing and π-π stacking for designing new organic electronics.

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Area of Science:

  • Organic electronics
  • Materials science
  • Crystallography

Background:

  • Chiral π-conjugated organic molecules possess unique chiroptical properties valuable for emerging technologies.
  • Molecular packing significantly influences the charge-transport properties of chiral molecules in electronic devices.
  • Understanding the relationship between molecular structure, interactions, and solid-state behavior is crucial but not fully elucidated.

Purpose of the Study:

  • To investigate the solid-state behavior of chiral [n]helicenes using crystal structure prediction (CSP).
  • To explore the lattice-energy landscape and packing motifs of [n]helicenes with varying lengths (n=3-12).
  • To establish structure-property relationships for designing functional organic electronics.

Main Methods:

  • Utilized crystal structure prediction (CSP) to model the lattice-energy landscape of [n]helicenes.
  • Analyzed packing motifs and π-π stacking interactions within predicted polymorphs.
  • Correlated CSP results with experimentally reported structures for validation.

Main Results:

  • CSP successfully predicted stable crystal structures for [n]helicenes, showing excellent agreement with experimental data.
  • Identified distinct packing motifs and π-π stacking arrangements influenced by helicene length.
  • Demonstrated that helicene length is a key factor controlling molecular shape and solid-state interactions.

Conclusions:

  • CSP is a powerful tool for understanding the solid-state behavior of chiral organic molecules.
  • Helicene length dictates molecular packing and electronic properties, offering a design handle for organic electronics.
  • This study provides insights for rationally designing chiral organic materials with tailored functionalities for electronic applications.