Thermal equilibria between conformers enable highly reliable single-fluorophore ratiometric thermometers

Fluorescent thermometers based on organic dyes play an important role in the visualization of dynamic temperature topography with high resolution. Many molecular thermometers contain two fluorophores with different temperature responses to achieve ratiometric temperature detection. However, the stab...

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Bibliographic Details
Published in:Analyst (London) 2021-06, Vol.146 (13), p.4219-4225
Main Authors: Shen, Tianruo, Wu, Xia, Tan, Davin, Xu, Zhaochao, Liu, Xiaogang
Format: Article
Language:English
Subjects:
Chemical compounds
Chemical synthesis
Dyes
Emission spectra
Fluorescence
Isomers
Reliability
Stability
Thermometers
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Summary:Fluorescent thermometers based on organic dyes play an important role in the visualization of dynamic temperature topography with high resolution. Many molecular thermometers contain two fluorophores with different temperature responses to achieve ratiometric temperature detection. However, the stability and reliability of such ratiometric thermometers are highly dependent on the susceptibility of the fluorophores towards photobleaching. Despite the use of single-fluorophore ratiometric thermometers in previous reports, the difficulty and complexity in their molecular design and synthesis severely hinder their widespread applicability. In this work, we have investigated the use of commercially available dyes ( i.e. , BD140 and LD688 ) with conformational isomers as ratiometric thermometers. Each of these dyes consists of a mixture of conformers with distinct UV-vis absorption and emission spectra. The thermal equilibrium of these conformers successfully enabled the development of ratiometric thermometers with good stability and reliability. We proposed a simple method to establish the single-fluorophore ratiometric thermometers based on the conversion between conformers of fluorophores in the ground state. This design method is applicable to many widely available fluorophores.
ISSN:0003-2654
1364-5528
DOI:10.1039/d1an00741f