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Related Concept Videos

Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Properties of Enantiomers and Optical Activity02:24

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
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Colors and Magnetism03:02

Colors and Magnetism

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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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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Updated: Jun 11, 2025

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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Reversible Interconversion between Ag2 and Ag6 Clusters and Their Responsive Optical Properties.

Huixin Xiang1,2, Yanze Wang2, Xinqi Xu3

  • 1Strait Laboratory of Flexible Electronics, Fujian Key Laboratory of Flexible Electronics, Strait Institute of Flexible Electronics, Fujian Normal University, Fuzhou 350117, China.

Journal of the American Chemical Society
|October 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel silver clusters (Ag2 and Ag6) that reversibly change structure with solvent. Ag2 clusters show superior X-ray imaging, enabling sensitive detection for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Metal clusters are crucial for understanding structure-property relationships.
  • External stimuli can trigger structural interconversions in clusters.
  • Developing novel clusters for advanced applications is an active research area.

Purpose of the Study:

  • To synthesize and characterize novel silver clusters (Ag2 and Ag6).
  • To investigate the solvent-dependent reversible structural transformations of these clusters.
  • To evaluate their potential for X-ray imaging applications.

Main Methods:

  • Synthesis of silver clusters (Ag2 and Ag6).
  • Characterization using mass spectrometry, single-crystal X-ray diffraction, photoluminescence, and radioluminescence spectroscopy.
  • Fabrication and testing of flexible scintillator films.

Main Results:

  • Ag2 and Ag6 clusters exhibit reversible structural changes in response to solvent variations.
  • Both clusters show excellent photoluminescence; Ag2 has superior X-ray radioluminescence.
  • Ag2-based scintillator films achieve high spatial resolution (15.0 lp/mm) and low X-ray detection limits (0.58 μGy s-1).

Conclusions:

  • A novel approach for designing thiol-free silver clusters with solvent-dependent interconversion was developed.
  • The findings offer new insights into silver cluster design for advanced X-ray imaging.
  • Ag2 clusters demonstrate significant potential for high-performance X-ray detection systems.