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<p>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.</p>

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Absorption and Emission Spectral Responses of a Luminescent Metal Framework Modified with a Rose Bengal-Based Sensitizer Triggered by Dipicolinate

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Wei Sun,
  • Zhengwei Tang,
  • Xinhua Qin

摘要

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.