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A Fluorescence-Detected Coordination-Induced Spin State Switch.

Hannah Kurz1, Konstantin Schötz2, Ilias Papadopoulos3

  • 1Inorganic Chemistry IV, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany.

Journal of the American Chemical Society
|February 26, 2021
PubMed
Summary
This summary is machine-generated.

We developed fluorescent nickel(II) complexes for sensitive detection of spin state changes. These complexes offer digital sensing capabilities, significantly improving upon existing methods for coordination number induced spin state (CISSS) detection.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Sensor Technology

Background:

  • Coordination number induced spin state (CISSS) is key for smart sensors but lacks sensitive detection.
  • Existing CISSS detection methods are often insensitive, limiting practical applications.

Purpose of the Study:

  • To synthesize novel nickel(II) complexes for sensitive CISSS detection.
  • To investigate the fluorescence properties of these complexes for sensing applications.
  • To establish a digital sensing platform based on fluorescence quenching.

Main Methods:

  • Synthesis and characterization of nickel(II) complexes with phenazine-based Schiff base ligands.
  • Solution-phase spectroscopy (NMR, UV-vis) and single-crystal X-ray diffraction.
  • Photophysical studies including temperature-dependent lifetime and quantum yield.
  • Theoretical modeling to understand CISSS mechanisms.

Main Results:

  • Successfully synthesized and characterized four planar nickel(II) complexes.
  • Demonstrated sensitive CISSS detection using fluorescence quenching.
  • Observed a digital (on/off) fluorescence response to axial ligand addition.
  • FD-CISSS showed higher sensitivity compared to absorption-based methods.

Conclusions:

  • Developed highly sensitive fluorescent nickel(II) complexes for CISSS detection.
  • Established a digital sensing mechanism based on fluorescence quenching.
  • Highlighted the potential of these complexes for advanced smart sensor materials.