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Related Concept Videos

Radical Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

3.9K
Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
3.9K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

6.0K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
6.0K
Chirality02:25

Chirality

25.6K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
25.6K
Metallic Solids02:37

Metallic Solids

19.0K
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....
19.0K
Prochirality02:05

Prochirality

4.0K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.0K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

9.3K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Related Experiment Video

Updated: Sep 19, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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3D Chiral Metal Halide Semiconductors.

Marco Moroni1, Luca Gregori2,3, Clarissa Coccia1

  • 1University of Pavia, Department of Chemistry and INSTM, Via Taramelli 16, 27100 Pavia, Italy.

ACS Energy Letters
|June 19, 2025
PubMed
Summary

Chiral metal halides using small 3-aminoquinuclidine cations create 3D semiconductors. These materials offer efficient charge transport for advanced nonlinear optoelectronic and spintronic devices.

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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Last Updated: Sep 19, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique
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The Synthesis of [Sn10SiSiMe334]2- Using a Metastable SnI Halide Solution Synthesized via a Co-condensation Technique

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Chemistry

Background:

  • Chiral metal halides are key for nonlinear optics and spin-selective devices.
  • Current methods use large organic cations, limiting dimensionality and charge transport.

Purpose of the Study:

  • To design novel chiral metal halides with enhanced properties.
  • To explore the potential of small chiral cations for 3D semiconductor networks.

Main Methods:

  • Synthesis of chiral metal halides using (R/S)-3-aminoquinuclidine (3-AQ) cations.
  • Structural characterization of the (R/S-3AQ)-Pb2Br6 compound.
  • Investigation of optoelectronic properties including bandgap and photoexcitation.
  • Circular dichroism and Rashba effect analysis.

Main Results:

  • A new family of chiral metal halides with a 3D corner-sharing octahedral network was synthesized.
  • The material exhibits a direct bandgap, isotropic band structure, and 3D photoexcitation.
  • Circular dichroism confirmed chiral anisotropy, and a Rashba effect was observed due to spin-orbit coupling and lack of inversion symmetry.

Conclusions:

  • The (R/S-3AQ)-Pb2Br6 system represents a new class of chiral semiconductors.
  • These materials offer tunable chemistry and efficient 3D charge transport.
  • They provide a promising platform for next-generation nonlinear optoelectronic and spintronic devices.