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A Rational Approach to Selective Recognition of NH(4)(+) over K(+).

Chin1, Walsdorff, Stranix

  • 1Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6 (Canada).

Angewandte Chemie (International Ed. in English)
|October 3, 1999
PubMed
Summary

A novel ion-selective electrode (ISE) using receptor 1 shows superior selectivity for ammonium (NH4+) over potassium (K+). This advancement surpasses current commercial ISEs for accurate ion detection.

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Cobalt on Charcoal: A Convenient and Inexpensive Heterogeneous Pauson-Khand Catalyst This work supported by a grant from the Korea Science and Engineering Foundation (KOSEF) (1999-1-122-001-5) and the KOSEF through the Center for Molecular Catalysis. We thank Prof. T. Hyeon and S.-W. Kim for providing the mesoporous carbon and S.U.S. and S.I.L. thank the BK21 Fellowship.

Angewandte Chemie (International ed. in English)·2000

Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Ion-selective electrodes (ISEs) are crucial for monitoring specific ions in various matrices.
  • Existing ISEs often struggle with selectivity, particularly differentiating ammonium (NH4+) from potassium (K+).

Purpose of the Study:

  • To develop a highly selective ion-selective electrode (ISE) for ammonium (NH4+) detection.
  • To investigate the performance of a novel receptor (receptor 1) in an ISE for enhanced ion discrimination.

Main Methods:

  • Synthesis and characterization of receptor 1, featuring three imine nitrogen atoms.
  • Fabrication of an ion-selective electrode (ISE) incorporating receptor 1.
  • Potentiometric measurements to determine selectivity coefficients (K(NH4+/K+)) against potassium (K+).

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Main Results:

  • Receptor 1 based ISE demonstrated high selectivity for NH4+ over K+ with a selectivity coefficient (lg K(NH4+/K+)) of -2.6.
  • The imine nitrogen atoms in receptor 1 facilitate optimal hydrogen bonding with the tetrahedral NH4+ ion.
  • Achieved selectivity significantly exceeds that of commercial nonactin-based ISEs (lg K(NH4+/K+) = -1.0).

Conclusions:

  • Receptor 1 is a highly effective component for creating selective ISEs for ammonium.
  • The design of receptor 1 offers a promising strategy for improving ion recognition in electrochemical sensors.
  • This ISE provides a significant advancement for accurate and reliable ammonium determination.