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Related Concept Videos

Crown Ethers02:36

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules take.
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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.

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Related Experiment Video

Updated: Jun 28, 2026

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Cation complexing of crown ethers using fluorescence spectroscopy, part II.

C Erk1, A Göçmen

  • 1Organic Chemistry Laboratoires, Chemistry Department, Istanbul Technical University, Maslak, 80626 Istanbul, Turkey.

Talanta
|October 31, 2008
PubMed
Summary

Macrocyclic ethers like benzo[12]crown-4 and benzo[15]crown-5 form complexes with Mg(2+), Li(+), and Na(+) ions. Fluorescence spectroscopy revealed varying binding affinities, with Mg(2+) showing strong complexation with benzo[15]crown-5.

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Last Updated: Jun 28, 2026

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry

Background:

  • Macrocyclic ethers are known for their ability to selectively bind metal cations.
  • Understanding these interactions is crucial for applications in ion sensing and separation.

Purpose of the Study:

  • To investigate the complexation behavior of benzo[12]crown-4, benzo[15]crown-5, and benzo[18]crown-6 with Mg(2+), Li(+), and Na(+) ions.
  • To determine the stoichiometry and equilibrium constants of these complexation reactions.

Main Methods:

  • Steady-state fluorescence emission spectroscopy in acetonitrile.
  • Analysis of complexation-enhanced quenched fluorescence spectra (CEQFS).

Main Results:

  • The macrocyclic ethers demonstrated ion complexation capabilities.
  • A 1:1 stoichiometry was determined for the complexes.
  • Equilibrium constants (K(e)) showed distinct trends: Mg(2+) > Na(+) > Li(+) for benzo[15]crown-5, and Na(+) > Mg(2+) > Li(+) for benzo[12]crown-4 at 298 K.

Conclusions:

  • Fluorescence spectroscopy is an effective method for studying macrocycle-cation interactions.
  • The binding selectivity of macrocyclic ethers is dependent on both the crown ether structure and the specific cation.
  • These findings contribute to the understanding of host-guest chemistry and potential applications in ion recognition.