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Related Concept Videos

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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Updated: May 25, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Constrained digold(I) diaryls: syntheses, crystal structures, and photophysics.

David V Partyka1, Thomas S Teets, Matthias Zeller

  • 1Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 13, 2012
PubMed
Summary

New dinuclear gold(I) complexes with aryl ligands were synthesized and studied. These gold complexes exhibit triplet-state emission, originating from aryl-ligand transitions, offering insights into their photophysical properties.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Area of Science:

  • Organometallic Chemistry
  • Photophysics
  • Materials Science

Background:

  • Gold(I) complexes are known for their unique electronic and photophysical properties.
  • Dinuclear gold complexes offer opportunities for novel structural and electronic configurations.
  • Understanding luminescence in organometallic compounds is crucial for developing new optical materials.

Purpose of the Study:

  • To synthesize and characterize a series of dinuclear gold(I) aryl complexes.
  • To investigate the photophysical properties, including emission characteristics and excited-state lifetimes.
  • To explore the electronic structures using computational methods and compare them with experimental observations.

Main Methods:

  • Synthesis of dinuclear gold(I) complexes with various phosphine ligands (DPEphos, DBFphos, Xantphos) and aryl groups (naphthyl, phenanthryl, pyrenyl).
  • Characterization using multinuclear NMR spectroscopy, optical spectroscopy (static and time-dependent), mass spectrometry, microanalysis, and X-ray crystallography.
  • Density Functional Theory (DFT) calculations for electronic structure analysis and time-resolved DFT for emission mechanism investigation.

Main Results:

  • Successful preparation and full characterization of dinuclear gold(I) aryl complexes.
  • Experimental evidence of triplet-state emission at low temperatures in toluene for both mononuclear and dinuclear complexes.
  • DFT calculations indicate that emission originates from aryl-ligand transitions, irrespective of the LUMO location.

Conclusions:

  • Dinuclear gold(I) aryl complexes exhibit characteristic triplet-state emission.
  • The photophysical behavior is influenced by the aryl ligands and the dinuclear structure.
  • Time-resolved DFT calculations provide valuable insights into the origin of luminescence in these gold complexes.