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Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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Complexometric Titration: Ligands00:43

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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...
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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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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Advances in anion binding and sensing using luminescent lanthanide complexes.

Samantha E Bodman1, Stephen J Butler1

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Luminescent lanthanide complexes offer sensitive anion detection in biological settings. These advanced receptors enable real-time monitoring and imaging of specific anions, crucial for biological and environmental sensing.

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Area of Science:

  • Coordination Chemistry
  • Analytical Chemistry
  • Biophysical Chemistry

Background:

  • Luminescent lanthanide (Ln(iii)) complexes are key tools for anion sensing.
  • Europium(iii) and terbium(iii) complexes possess unique photophysical properties beneficial for biological applications.
  • Existing methods require improved selectivity and sensitivity for complex biological media.

Purpose of the Study:

  • To review recent advancements in luminescent Ln(iii) receptors for selective anion recognition.
  • To explore strategies for enhancing anion binding affinity and selectivity through ligand design.
  • To highlight applications in biological and environmental anion sensing.

Main Methods:

  • Design and synthesis of novel organic ligands for Ln(iii) complexation.
  • Investigation of anion binding mechanisms and luminescence response.
  • Evaluation of receptor performance in biological media and living cells.

Main Results:

  • Ln(iii) complexes demonstrate long luminescence lifetimes and line-like emission for sensitive detection.
  • Tailored ligand structures enable rapid, reversible anion binding with high selectivity.
  • Successful detection and imaging of specific anions in human serum and living cells.

Conclusions:

  • Luminescent Ln(iii) receptors offer a powerful platform for selective anion sensing in complex environments.
  • Ligand engineering is crucial for optimizing selectivity and sensitivity in biological imaging.
  • These receptors hold significant potential for real-time monitoring of biological processes and environmental analysis.