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Two macrocycle-based sensors for anions sensing.

Yingjie Liu1, Zhixiang Zhao2, Ran Huo2

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Summary
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Two novel macrocyclic bis-benzimidazolium salts were synthesized and characterized. These compounds demonstrate selective detection of acetate and nitrate anions, offering potential for sensitive anion recognition applications.

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry

Background:

  • Macrocyclic compounds are extensively studied for their host-guest chemistry.
  • Bis-benzimidazolium salts offer unique structural features for molecular recognition.

Purpose of the Study:

  • To synthesize and characterize novel macrocyclic bis-benzimidazolium salts.
  • To investigate the anion recognition capabilities of these synthesized salts.

Main Methods:

  • Synthesis and structural confirmation via X-ray crystallography and NMR spectroscopy (1H, 13C).
  • Anion recognition studies using fluorescence, UV-Vis spectroscopy, 1H NMR titrations, Mass Spectrometry (MS), and Infrared (IR) spectroscopy.

Main Results:

  • Two macrocyclic bis-benzimidazolium salts, 2 (23-membered) and 4 (25-membered), were successfully prepared and structurally verified.
  • Salt 2 exhibited selective detection of the acetate anion.
  • Salt 4 demonstrated selective detection of the nitrate anion, both with high sensitivity.

Conclusions:

  • The synthesized macrocyclic bis-benzimidazolium salts are effective platforms for selective anion sensing.
  • These findings highlight the potential of these compounds in developing sensitive analytical tools for specific anion detection.