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Related Concept Videos

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Related Experiment Video

Updated: Apr 1, 2026

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
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A soluble cryogenic thermometer with high sensitivity based on excited-state configuration transformations.

Jianwei Chen1, Yishi Wu, Xuedong Wang

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China. hongbing.fu@iccas.ac.cn jnyao@iccas.ac.cn yswu@iccas.ac.cn.

Physical Chemistry Chemical Physics : PCCP
|October 3, 2015
PubMed
Summary

A novel fluorescent sensor, 9-(9,9-dimethyl-9H-fluoren-3yl)-14-phenyl-9,14-dihydrodibenzo[a,c]phenazine (FIPAC), demonstrates high sensitivity for cryogenic temperature detection. This FIPAC-based thermometer operates effectively across a broad temperature range, offering a promising solution for low-temperature measurements.

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Area of Science:

  • Cryogenic temperature sensing
  • Fluorescent molecular probes
  • Low-temperature physics

Background:

  • Accurate cryogenic temperature measurement is crucial for scientific exploration.
  • Developing sensitive and convenient thermometers for low temperatures remains a significant challenge.
  • Existing methods often lack the required sensitivity or practicality for broad cryogenic applications.

Purpose of the Study:

  • To develop a novel, highly sensitive thermometer for cryogenic temperature detection.
  • To utilize the small molecule 9-(9,9-dimethyl-9H-fluoren-3yl)-14-phenyl-9,14-dihydrodibenzo[a,c]phenazine (FIPAC) for temperature sensing.
  • To elucidate the mechanism behind the dual emission feature of FIPAC in response to temperature changes.

Main Methods:

  • Employing FIPAC in 2-methyl-tetrahydrofuran (MeTHF) solution as the sensing medium.
  • Measuring the dual emission intensity ratio of FIPAC across a temperature range of 138 K to 343 K.
  • Analyzing the temperature dependence of the emission ratio using a single-exponential fitting model.
  • Investigating the underlying photophysical mechanism of the dual emission via excited-state configuration transformations.

Main Results:

  • The FIPAC system exhibits high sensitivity, reaching 19.4% K⁻¹ at 138 K.
  • The temperature-dependent emission intensity ratio follows a single-exponential decay.
  • A novel mechanism involving excited-state configuration transformations is proposed to explain the observed dual emission.
  • Experimental and theoretical validation confirms the feasibility of FIPAC as a cryogenic thermometer.

Conclusions:

  • FIPAC serves as a highly sensitive and accurate cryogenic thermometer.
  • The unique dual emission mechanism provides a new understanding of molecular behavior at low temperatures.
  • This research offers a practical and effective solution for cryogenic temperature monitoring in various scientific fields.