CC BY-NC-ND 4.0 · Organic Materials 2022; 4(04): 204-215
DOI: 10.1055/a-1953-0322
Short Review

Temperature-Dependent Dual Fluorescence from Small Organic Molecules

Min Wang
a   School of Chemistry and Chemical Engineering, Shandong University, Shanda Nanlu 27, Jinan 250100, P. R. of China
,
Run-Ze Wang
a   School of Chemistry and Chemical Engineering, Shandong University, Shanda Nanlu 27, Jinan 250100, P. R. of China
,
a   School of Chemistry and Chemical Engineering, Shandong University, Shanda Nanlu 27, Jinan 250100, P. R. of China
› Author Affiliations


Abstract

The temperature-dependent dual fluorescence from a single component of small organic molecules (SOMs) is very promising for the ratiometric fluorescence sensing of temperature. However, the SOM-based fluorophores typically only show one fluorescence band. It is thus very challenging to achieve dual fluorescence, let alone the dual fluorescence that is sensitive to temperature. Herein, in this short review, we briefly summarized the examples of SOM-based fluorophores exhibiting temperature-dependent dual fluorescence. Through representative examples, we mainly focus on the illustration of the intrinsic mechanisms of this unusual phenomenon, which may take place because of the presence of two local minimum conformations that are thermally equilibrated in the ground state, the presence of two local minimum conformations in the first excited state as the result of significant structural relaxation upon excitation, or the presence of thermal equilibrium between the first and second excited states. Hopefully, the discussions in this short review will provide some important guidelines for the further rational molecular design of such fluorophores.



Publication History

Received: 25 July 2022

Accepted after revision: 21 September 2022

Accepted Manuscript online:
29 September 2022

Article published online:
28 October 2022

© 2022. The authors. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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