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Related Concept Videos

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Updated: May 19, 2026

A Modified QuEChERS-HPLC Method for Detection of Polycyclic Aromatic Hydrocarbons in Zebrafish Embryos Exposed to Fine Particulate Matter
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Published on: June 13, 2025

ExBox: a polycyclic aromatic hydrocarbon scavenger.

Jonathan C Barnes1, Michal Juríček, Nathan L Strutt

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|August 30, 2012
PubMed
Summary
This summary is machine-generated.

A new box-shaped molecule, ExBox(4+), effectively captures various polycyclic aromatic hydrocarbons (PAHs) due to its large cavity and strong binding. This discovery enables PAH removal from complex mixtures like crude oil.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Polycyclic Aromatic Hydrocarbons (PAHs) are persistent environmental pollutants.
  • Efficient methods for capturing and removing PAHs are crucial for environmental remediation.
  • Designing molecular receptors with high affinity and selectivity for PAHs remains a challenge.

Purpose of the Study:

  • To synthesize a novel semi-rigid cyclophane, ExBox(4+), with a box-like geometry.
  • To investigate the host-guest complexation capabilities of ExBox(4+) with a diverse range of PAHs.
  • To demonstrate the practical application of ExBox(4+) in separating aromatic compounds from crude oil.

Main Methods:

  • Template-directed synthesis of the ExBox(4+) cyclophane.
  • Formation and characterization of inclusion complexes using single-crystal X-ray diffraction and UV/Vis spectroscopy.
  • Solution-state analysis of host-guest interactions via Nuclear Magnetic Resonance (NMR) spectroscopy and Isothermal Titration Calorimetry (ITC).
  • Proof-of-concept extraction of aromatic compounds from crude oil using the water-soluble ExBox·4Cl.

Main Results:

  • ExBox(4+) was successfully synthesized, adopting a box-like structure composed of π-electron-poor bipyridinium units.
  • ExBox(4+) demonstrated high-affinity scavenging of 11 different PAHs, including coronene, forming inclusion complexes.
  • Structural and spectroscopic data confirmed the promiscuous binding of ExBox(4+) to various PAHs in both organic and aqueous media.
  • NMR and ITC analyses provided detailed characterization of host-guest interactions and binding affinities in solution.
  • Aqueous ExBox·4Cl effectively extracted aromatic compounds from crude oil, with subsequent regeneration of the receptor.

Conclusions:

  • The ExBox(4+) cyclophane is a versatile and effective molecular receptor for a wide range of PAHs.
  • Its accommodating cavity and strong non-covalent interactions facilitate high-affinity complexation in diverse media.
  • ExBox(4+) shows significant potential for applications in environmental remediation and separation technologies, as demonstrated by crude oil extraction.