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Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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 Electrocyclic Reactions: Stereochemistry

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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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Electrochemiluminescent functionalizable cyclometalated thiophene-based iridium(III) complexes.

Marco Bandini1, Michele Bianchi, Giovanni Valenti

  • 1Dipartimento di Chimica G. Ciamician, Alma Mater Studiorum, Università di Bologna, via Selmi 2, 40126 Bologna, Italy. marco.bandini@unibo.it

Inorganic Chemistry
|January 16, 2010
PubMed
Summary

New iridium complexes featuring functional formyl groups on thiophene ligands were synthesized. These materials exhibit tunable electrochemical properties and consistent electrochemiluminescence, showing promise for functional material applications.

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Cyclometalated iridium complexes are crucial in optoelectronic applications.
  • Thiophene-based ligands offer versatile functionalization pathways.
  • Formyl groups can modulate electronic properties and enable further chemical modification.

Purpose of the Study:

  • To synthesize and characterize novel functional bis-cyclometalated thiophene-based cationic iridium complexes.
  • To investigate the impact of formyl group functionalization on electrochemical and photophysical properties.
  • To explore the potential of these complexes as functional materials.

Main Methods:

  • Synthesis of iridium complexes with thienyl-based cyclometalating ligands (thpy-CHO).
  • Full characterization including X-ray crystallography for three specific complexes.
  • Electrochemical analysis (cyclic voltammetry) to study reduction patterns and substituent effects.
  • Electrochemiluminescence (ECL) spectroscopy in acetonitrile.

Main Results:

  • Successful preparation and characterization of new functional bis-cyclometalated thiophene-based iridium complexes.
  • X-ray crystal structures determined for [Ir(thpy)(2)bpy]PF(6), [Ir(thpy-CHO)(2)bpy]PF(6), and [Ir(thpy-CHO)(2)phen]PF(6).
  • Detailed electrochemical behavior elucidated, showing rich reduction patterns influenced by substituents.
  • ECL spectra revealed similar emission profiles (shape and energy) across the studied complexes.

Conclusions:

  • Formyl group functionalization on thienyl ligands provides a route to novel iridium complexes with tunable properties.
  • These complexes exhibit stable electrochemical and electrochemiluminescent characteristics.
  • The synthesized iridium complexes hold potential for applications as functional materials in optoelectronics.