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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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 para position.
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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 eye.
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Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...

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Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
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Iridium(III) azuliporphyrins.

Timothy D Lash1, Komal Pokharel, Matthias Zeller

  • 1Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA. tdlash@ilstu

Chemical Communications (Cambridge, England)
|November 1, 2012
PubMed
Summary
This summary is machine-generated.

Novel iridium(III) derivatives were synthesized by reacting azuliporphyrins with an iridium precursor. These new compounds regioselectively incorporated oxidized solvent molecules, forming unique acyl units within the macrocycle.

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Published on: September 8, 2013

Area of Science:

  • Organometallic Chemistry
  • Porphyrin Chemistry

Background:

  • Azuliporphyrins are macrocyclic compounds with unique electronic properties.
  • Iridium complexes are valuable in catalysis and materials science.

Purpose of the Study:

  • To synthesize novel iridium(III) derivatives of azuliporphyrins.
  • To investigate the regioselective incorporation of solvent molecules into the porphyrinoid macrocycle.

Main Methods:

  • Reaction of azuliporphyrins with [Ir(COD)Cl](2) in refluxing o- or p-xylene.
  • Characterization of the resulting iridium(III) complexes.

Main Results:

  • Successful synthesis of novel iridium(III)-azuliporphyrin complexes.
  • Regioselective incorporation of oxidized solvent molecules (acyl units) into the macrocycle.
  • The iridium(III) center is inserted within the porphyrinoid ring.

Conclusions:

  • This study introduces a new class of iridium(III) complexes featuring functionalized azuliporphyrin ligands.
  • The reaction demonstrates a novel method for modifying porphyrinoid macrocycles with organometallic centers and solvent-derived units.