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 thermome-ters 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 thermome-ters 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 fluores-cence 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.
关键词
分子内电荷转移/比率荧光温度计/相变材料/三芳基硼/可调温度测量范围
Key words
Intramolecular charge-transfer/Ratiometric fluorescence thermometer/Phase change material/Triaryl-boron/Tunable temperature measurement range
维普
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