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Antenna Effect in Halogen-Containing ZnSm Coordination Compounds: Utilizing Colorimetry for a Room-Temperature

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Researchers developed novel molecular ratiometric thermometers using halogen-substituted bimetallic compounds. These offer precise, rapid, and stable remote temperature measurements, outperforming traditional methods.

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Area of Science:

  • Materials Science
  • Chemistry
  • Optics

Background:

  • Temperature-dependent photoluminescence (TDPL) is a key optical characterization technique.
  • Traditional ratiometric photothermal instruments face reproducibility issues due to reliance on doped materials.
  • Molecular ratiometric thermometers present an advanced alternative with enhanced precision, speed, and stability.

Purpose of the Study:

  • To synthesize and characterize novel halogen-substituted bimetallic coordination compounds for molecular ratiometric thermometry.
  • To investigate the temperature-dependent photoluminescence (TDPL) properties of these synthesized compounds.
  • To evaluate their potential as molecular ratiometric thermometers within a specific temperature range.

Main Methods:

  • A one-pot synthesis method was employed to create three halogen-substituted bimetallic coordination compounds (ZnSm-X, where X = Cl, Br, I).
  • Temperature-dependent photoluminescence (TDPL) measurements were conducted on the synthesized compounds in the temperature range of 253-333 K.
  • Colorimetry was utilized to assess the temperature-dependent photoluminescence of the ZnSm-Cl complex.

Main Results:

  • Three novel, reproducible halogen-substituted bimetallic coordination compounds (ZnSm-X) were successfully synthesized.
  • The compounds exhibited distinct temperature dependencies in their photoluminescence across the 253-333 K range.
  • ZnSm-Cl demonstrated a high relative sensitivity of 12.14% K⁻¹ at 268 K, attributed to efficient energy transfer between ligand and Sm³⁺.

Conclusions:

  • The synthesized ZnSm-X compounds show promise as molecular ratiometric thermometers.
  • The ZnSm-Cl complex, with its high sensitivity and tunable range, offers a new avenue for advanced temperature sensing.
  • This research provides novel insights into developing molecular ratiometric thermometers with improved performance characteristics.