Organic Thermometers Based on Aggregation of Difluoroboron β-Diketonate Chromophores

Abstract

We report several novel thermometers resulting from the temperature-induced aggregation of difluoroboron β-diketonate chromophores. These thermometers exhibit a much wider temperature-dependent fluorescence emission from 445 to 592 nm along with the color change from blue to red in a dilute chloroform solution. Spectroscopy measurements and theoretical calculations confirm that the thermochromic luminescence originates from the reversible change in the noncovalent intermolecular interactions and the abrupt volume shrinkage of the solvent at its melting point. The present work provides a new strategy for rationally designing high-performance thermometers having a wide emission property.

Recent advances in the synthesis of luminescent tetra-coordinated boron compounds

“…By changing the temperature, the fluorescence changed from green to orange which was utilized to detect the temperature. 30,31 As oxygen is essential in life, its detection is very important. Fraser and co-workers synthesized meta-alkoxy substituted boron-β-diketonates.…”

“…By changing the temperature, the fluorescence changed from green to orange which was utilized to detect the temperature. 30,31…”

Interface Engineering of Bi‐Fluorescence Molecules for High‐Performance Data Encryption and Ultralow UV‐Light Detection

“…It should be noted that due to the strong ability of the core structure of difluoroboron β-diketonate to withdraw electrons, DFBK chromophores exhibit obvious ICT characteristics. [45][46][47][48][49][50][51][52][53] The absorption spectra of DFBK are centered at around 395 nm, which was slightly affected by solvent polarity (Figure S1, Supporting Information). In contrast, the emission spectra of DFBK gradually red-shifted from 440 to 520 nm, with increasing solvent polarity (Figure S2, Supporting Information).…”

Fluorescence thermometers: intermediation of fundamental temperature and light

“…However, the massive and complicated categories of FTs 75–99 are an obstacle in achieving a systematic understanding and comprehensive cognition of fluorescence thermometry. 100–103 Intensity and wavelength are two of the most common and important fluorescence signal readouts; thus, by establishing their essential relationship with temperature fluctuation, it is expected that our understanding of cell thermometry will deepen significantly.…”