Molecular structure perspective on Temperature-Sensitive properties of rhodamine aqueous solutions

Ting Liu*, Jianwei Huang, He Ding, Chengsen Zhan, Shouyu Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

As one of the most commonly used organic fluorescent dyes, recently rhodamines have been successfully employed in temperature sensing. However, few works have been reported on their temperature-sensitive properties, which inevitably limiting their further applications. In order to solve such problem, we investigated temperature-sensitive properties of rhodamine 110, 123, 19, 6G, B and 3B focusing on their fluorescence emission spectra; and analyzed them in the molecular structure perspective. It is demonstrated that the fluorescence emission intensities of all studied rhodamines decreased with higher temperature, which inevitably enhances the probability of collisions among molecules, thus definitely leads to energy loss in fluorescence emission. While these rhodamines still have various temperature sensitivities mainly due to the substitutes: the substitute on the benzene carboxylate has little effect; the amino substituents of the three-ring xanthene enhance the temperature sensitivity due to their rotation weakening the rigidity of the three-ring xanthene; and the methyl substituents on the three-ring xanthene reduce the temperature sensitivity by enhancing the rigidity and stability of the three-ring xanthene as well as hindering the rotation of ethylamino. These findings can also be extended to other organic fluorescent dyes proved by coumarins comparable to rhodamines. The results provided by this work can be useful reference and guidance to further develop organic fluorescent dyes especially for temperature sensing.

Original languageEnglish
Article number121166
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume275
DOIs
Publication statusPublished - 5 Jul 2022
Externally publishedYes

Keywords

  • Fluorescence emission spectra
  • Light absorption spectra
  • Molecular structure
  • Rhodamines
  • Temperature-sensitive properties

Fingerprint

Dive into the research topics of 'Molecular structure perspective on Temperature-Sensitive properties of rhodamine aqueous solutions'. Together they form a unique fingerprint.

Cite this

Liu, T., Huang, J., Ding, H., Zhan, C., & Wang, S. (2022). Molecular structure perspective on Temperature-Sensitive properties of rhodamine aqueous solutions. Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 275, Article 121166. https://doi.org/10.1016/j.saa.2022.121166