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A supramolecular H-bond driven light switch sensor for small anions.

S A Rommel1, D Sorsche1, S Rau1

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This study introduces a cationic iridium complex as a luminescent sensor for anions. It effectively detects anions by switching luminescence on or off, enhancing sensitivity through competitive binding.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Chemical Sensing

Background:

  • Cationic iridium complexes are explored for their luminescent properties.
  • Luminescent sensors offer sensitive detection methods for various analytes.
  • Anion recognition is crucial in chemical and biological systems.

Purpose of the Study:

  • To develop a cationic iridium complex capable of sensing various anions.
  • To investigate the mechanism of luminescence switching based on anion binding.
  • To enhance the sensitivity of the luminescent sensor system.

Main Methods:

  • Synthesis of a cationic iridium complex featuring a 2,2 -bibenzimidazole ligand.
  • Spectroscopic analysis to monitor luminescence changes upon anion interaction.
  • Investigation of hydrogen bonding and ion-pair interactions in the sensing mechanism.

Main Results:

  • The iridium complex functions as a luminescent sensor for anions.
  • Luminescence is quenched by dinitro-benzoate via strong H-bond supported ion pair bonding.
  • Luminescence is restored upon displacement by smaller, competing H-bonded anions, indicating enhanced sensitivity.

Conclusions:

  • The developed iridium complex demonstrates effective anion sensing capabilities.
  • The luminescence switching mechanism relies on competitive hydrogen bonding interactions.
  • The sensor system exhibits enhanced sensitivity due to anion displacement effects.