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Absorption and Emission Spectral Responses of a Luminescent Metal Framework Modified with a Rose Bengal-Based Sensitizer Triggered by Dipicolinate
Abstract
This work reports on a composite nanostructure for the detection of dipicolinate (DPA), using a luminescent metal-organic framework (MOF) as the supporting lattice and a Rose Bengal-derived organic dye as the sensing probe. This composite structure was characterized by X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, and photophysical analyses. Two possible sensing paths were identified: colorimetric sensing based on absorption spectra and ratiometric fluorescent sensing based on emission spectra. The sensing mechanism involved a combination of the dye emission turn-on effect induced by DPA and the Eu emission turn-off effect caused by an energy transfer process. Linear sensing responses and good selectivity were observed for both sensing pathways, with a limit of detection of 2.2 μM. The advantage of this composite structure lies in its capability for naked-eye detection and the presence of two sensing pathways with linear responses.
Keywords
Supporting agencies: This work was financially supported by the National Natural Science Foundation of China (No. 21401036), Natural Science Foundation of Anhui Province (No. 1508085QB27), Major Project of Hefei Normal University (No. 2021KJZD02), Electronic Information System Simulation Design Anhui Province Key Laboratory Open Fund Project (No. 2023ZDSYS02), Key Projects of Natural Science Research in Universities of Anhui Province (No. 2023AH051319), Hefei Normal University High-Level Talent Research Fund Project (No. 2022rcjj31), and the Project of Excellent Talents Support Plan in Colleges of Anhui Province (No. gxyq2022058).
About the Authors
W. Sun
Hefei Normal University
China
China
Wei Sun - School of Electronic Information and Integrated Circuits, Hefei Normal University; Anhui Province Key Laboratory of Simulation and Design for Electronic Information System, Hefei Normal University.
Hefei
Z. Tang
Hefei Normal University
China
China
Zhengwei Tang - School of Electronic Information and Integrated Circuits, Hefei Normal University.
Hefei
X. Qin
Lvliang Vocational and Technical College
China
China
Xinhua Qin - Department of Mechanical and Electrical Engineering, Lvliang Vocational and Technical College.
Lvliang
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Review
For citations:
Sun W., Tang Z., Qin X. Absorption and Emission Spectral Responses of a Luminescent Metal Framework Modified with a Rose Bengal-Based Sensitizer Triggered by Dipicolinate. Zhurnal Prikladnoii Spektroskopii. 2026;93(2):287-1-287-7.
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