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Related Concept Videos

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...
Colors and Magnetism03:02

Colors and Magnetism

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.
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting
08:57

A Novel Technique for Generating and Observing Chemiluminescence in a Biological Setting

Published on: March 9, 2017

Luminescent cyclometalated gold(III) complexes.

Catherine Bronner1, Oliver S Wenger

  • 1Georg-August-Universität Göttingen, Institut für Anorganische Chemie, Göttingen, Germany.

Dalton Transactions (Cambridge, England : 2003)
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

Researchers are developing luminescent gold(III) compounds using strong cyclometalating ligands to achieve room temperature emission in fluid solution, overcoming previous limitations for these gold complexes.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Gold(I) compounds are widely known for their luminescence.
  • Most reported gold(III) complexes previously lacked room temperature emission in fluid solution.
  • Achieving luminescence in gold(III) complexes presents a significant challenge.

Purpose of the Study:

  • To discuss recent progress in developing luminescent gold(III) compounds.
  • To highlight the importance of strong ligand fields for luminescence.
  • To compare gold(III) complexes with isoelectronic platinum(II) complexes.

Main Methods:

  • Utilizing cyclometalating ligands to create strong ligand fields around gold(III).
  • Investigating the photophysical properties of novel gold(III) complexes.
  • Comparing luminescence properties with related platinum(II) complexes.

Main Results:

  • Cyclometalating ligands are key to achieving favorable luminescence in gold(III) compounds.
  • Strong ligand fields are essential for room temperature emission in fluid solution.
  • Emerging research shows promise for luminescent gold(III) materials.

Conclusions:

  • The strategic use of cyclometalating ligands is crucial for unlocking the luminescence potential of gold(III) complexes.
  • This research advances the development of novel luminescent materials based on gold(III).
  • Further comparisons with platinum(II) complexes will deepen understanding of photophysical properties.