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Related Concept Videos

Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Radical Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

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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:
3.7K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
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
1.8K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
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.
2.3K
Prochirality02:05

Prochirality

3.8K
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...
3.8K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.0K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Updated: Jun 5, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Toward Rhenium-Based Circularly Polarized OLEDs Using Tailored Chiral Re(CO)3 Emitters.

Maria P Davydova1, Ting Xu2, Alexander M Agafontsev3

  • 1Nikolaev Institute of Inorganic Chemistry, SB RAS, 3, Lavrentiev Ave., 630090, Novosibirsk, Russia.

Angewandte Chemie (International Ed. in English)
|December 16, 2024
PubMed
Summary

Researchers developed new chiral rhenium(I) complexes for enhanced circularly polarized phosphorescence (CPP) and demonstrated circularly polarized electroluminescence (CPEL) from rhenium emitters for the first time, paving the way for advanced CP-OLEDs.

Keywords:
Circularly polarized electroluminescenceCircularly polarized luminescenceMagnetically sensitive luminescencePhosphorescent emittersRhenium

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Chiral rhenium(I) complexes are key for circularly polarized phosphorescence (CPP) in organic light-emitting diodes (CP-OLEDs).
  • Existing rhenium(I) emitters have limitations in efficiency and have not been utilized for circularly polarized electroluminescence (CPEL).

Purpose of the Study:

  • To design and synthesize novel chiral Re(I) complexes with improved CPP properties.
  • To demonstrate CPEL from rhenium emitters for the first time.
  • To explore the potential of these emitters in CP-OLED applications.

Main Methods:

  • Synthesis of enantiomeric Re(I) complexes by incorporating chiral menthol groups into 1,10-phenanthroline ligands.
  • Characterization of photophysical properties, including CPP and quantum efficiency.
  • Fabrication and testing of Re(I)-based CP-OLEDs to evaluate CPEL performance.

Main Results:

  • The synthesized Re(I) complexes exhibit yellow CPP with enhanced |glum| factors (up to 2.5×10-2) and good quantum efficiency.
  • The first demonstration of CPEL from rhenium emitters was achieved.
  • The developed CP-OLEDs show yellow CPEL with |gEL| factors up to 6.2×10-3 and a maximum external quantum efficiency of 13.2%.

Conclusions:

  • Chiral Re(I) complexes offer significant potential for CPEL applications.
  • This study provides a new route for developing CPP-active Re(I) complexes.
  • The findings open avenues for next-generation CP-OLEDs with improved performance.