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Related Experiment Video

Updated: Jul 11, 2026

Simultaneous Electrophysiological Recording and Calcium Imaging of Suprachiasmatic Nucleus Neurons
09:42

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Published on: December 8, 2013

A calixarene based fluorescent Sr2+ and Ca2+ probe.

Hai-Feng Ji1, Yuming Yang, Xiaohe Xu

  • 1Department of Chemistry and Institute for Micromanufacturing, Louisiana Tech University, Ruston, LA 71272, USA. hji@chem.latech.edu

Organic & Biomolecular Chemistry
|February 24, 2006
PubMed
Summary
This summary is machine-generated.

A novel fluorescent probe, PyCalix, selectively detects strontium ions (Sr2+). This calix[4]arene-based compound exhibits unique fluorescence changes upon binding with alkaline earth metal cations, enabling sensitive Sr2+ detection in a polyvinyl chloride membrane sensor.

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Calix[4]arene derivatives are versatile platforms for host-guest chemistry.
  • Fluorescent probes offer sensitive detection methods for metal ions.
  • Selective detection of strontium ions is crucial in environmental and nuclear applications.

Purpose of the Study:

  • To synthesize and characterize a novel fluorescent probe, PyCalix, based on calix[4]arene.
  • To investigate the complexation behavior of PyCalix with alkali and alkaline earth metal cations using fluorescence spectrometry.
  • To develop a selective sensor for strontium ions using a PyCalix-doped polyvinyl chloride membrane.

Main Methods:

  • Synthesis of PyCalix, a calix[4]arene derivative with two pyrene moieties.
  • Fluorescence spectrometry to study cation complexation and probe response.
  • Fabrication of a polyvinyl chloride (PVC) membrane doped with PyCalix.

Main Results:

  • PyCalix exhibited intramolecular excimer emission around 480 nm.
  • Complexation with alkaline earth metal cations decreased excimer emission and increased monomer emission (397 nm).
  • The complexation order was Sr2+ ≈ Ca2+ > Ba2+ > Mg2+ > K+ > Na+ > Cs+.
  • The PyCalix-doped PVC membrane demonstrated selective detection of Sr2+.

Conclusions:

  • PyCalix is a sensitive fluorescent probe for alkaline earth metal cations.
  • The probe's fluorescence response is modulated by cation binding.
  • The PyCalix-doped PVC membrane provides a selective and effective method for Sr2+ detection.