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Fluorescence Switching for Temperature Sensing in Water.

Yeting Zheng1, Yasniel Meana1, Mercedes M A Mazza1

  • 1Laboratory for Molecular Photonics, Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431, United States.

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Researchers developed a novel fluorescent molecular switch for precise, noninvasive temperature sensing. This water-soluble probe offers millisecond response times and micrometer-level resolution, overcoming limitations of traditional thermometers.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Fluorescence Spectroscopy

Background:

  • Accurate temperature measurement at the microscale is crucial for various scientific disciplines.
  • Conventional thermometers face limitations in spatial resolution and noninvasive capabilities.
  • Single-wavelength fluorescent probes are susceptible to environmental fluctuations, affecting accuracy.

Purpose of the Study:

  • To develop a water-soluble, thermochromic molecular switch for ratiometric temperature sensing.
  • To achieve noninvasive temperature mapping at the micrometer level with high temporal resolution.
  • To overcome the limitations of existing fluorescent probes for temperature measurements.

Main Methods:

  • Assembly of a molecular switch by integrating a coumarin fluorophore, oligo(ethylene glycol) chain, and oxazole heterocycle.
  • Utilizing spectrally resolved fluorescence in two interconvertible states for ratiometric output.
  • Employing fluorescence microscopy for noninvasive temperature measurements in aqueous solutions and hydrogels.

Main Results:

  • Successful synthesis of a water-soluble thermochromic molecular switch in three steps.
  • Demonstrated ratiometric temperature sensing with millisecond response and micrometer resolution.
  • Overcame limitations of single-wavelength probes, enabling accurate temperature mapping in complex environments.

Conclusions:

  • The developed fluorescent molecular switch provides a powerful tool for advanced temperature sensing applications.
  • Its ratiometric output ensures reliable measurements, unaffected by probe concentration or photobleaching.
  • This technology opens new avenues for noninvasive thermal analysis at unprecedented length scales.