Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (8): 20240189.doi: 10.7503/cjcu20240189

• Analytical Chemistry • Previous Articles     Next Articles

Solid Tunable Ratiometric Fluorescence Thermometers Based on Triarylboron-Phase Change Materials

LIU Xuan(), CHEN Qipei, OU Jingmei(), HOU Jian   

  1. School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
  • Received:2024-04-15 Online:2024-08-10 Published:2024-07-03
  • Contact: LIU Xuan, OU Jingmei E-mail:1060135@hnust.edu.cn;1007924398@qq.com
  • Supported by:
    the National Natural Science Foundation of China(21703062);the Teaching Reform Innovation Programs of Higher Education Institutions of Hunan Province, China(2023JGYB194)

Abstract:

Microregion viscosity and free volume of phase change materials(PCMs) undergo reversible and rapid changes near the melting point, which can amplify the responses of fluorescent probes. In this study, two novel triarylborons, 4-(1-{4-[bis(4-bromo-2,3,5,6-tetramethylphenyl)boraneyl]-2,3,5,6-tetramethylphenyl}piperidin-4-yl)morpholine(MPDB1) and 4,4'-({[(4-bromo-2,3,5,6-tetramethylphenyl)boranediyl]bis(2,3,5,6-tetramethyl-4,1-phenylene)}bis(piperidine-1,4-diyl))dimorpholine(MPDB2), with ratiometric-responsive fluorescence to high viscosity were synthesized and then combined with PCMs, thus high-sensitivity ratiometric fluorescence thermometers were prepared. Due to the compounds’ rare high viscosity responsiveness, the temperature fluorescence response ranges in the PCMs are lower than their melting point, thus producing pure solid-state PCMs fluorescent thermometers with better processability. As viscosity probes, the fluorescence of the mono-substituted compound MPDB1 shows a ratiometric response range of 100—3000 mPa·s with high sensitivity, while the fluorescence of the compound MPDB2 responds from 100 to 46000 mPa·s, covering a wider range. As temperature probes, the fluorescence temperature response range of the MPDB1-polyethylene glycol 20000(PEG20000) system is ‒10—50 ℃, with a high maximum relative sensitivity of 3.5%(Sr, 10 ℃) and absolute sensitivity of 4.6%(Sa, 30 ℃). Also, the temperature measurement range of these thermometers can be adjusted by changing the number of substituents and selecting PEG substrates with different melting points, rendering better applicability.

Key words: Intramolecular charge-transfer, Ratiometric fluorescence thermometer, Phase change material, Triarylboron, Tunable temperature measurement range

CLC Number: 

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