A white-light-emitting lanthanide metal-organic framework for luminescence turn-off sensing of MnOand turn-on sensing of folic acid and construction of a "turn-on plus" system
New Journal of Chemistry, ISSN: 1369-9261, Vol: 44, Issue: 25, Page: 10239-10249
2020
- 28Citations
- 12Captures
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Article Description
A novel single-phase white-light-emitting microscale lanthanide metal-organic framework [Eu0.06Tb0.04Gd0.9(HDPNC)1.5(H2O)(DMF)]·2H2O (H3DPNC = 5-(3′,5′-dicarboxylphenyl) nicotinic acid) abbreviated as Eu0.06Tb0.04Gd0.9-DPNC was obtained successfully under 365 nm excitation, by adjusting the molar ratio of Ln3+ and different excitation wavelengths, with the Commission Internationale de l'Eclairage (CIE) coordinates of (0.3328, 0.3296). The tri-emission lanthanide metal-organic framework (Eu0.06Tb0.04Gd0.9-DPNC), acting as an effective fluorescent platform, not only exhibits notable fluorescence quenching (turn-off) toward MnO4- in water through the fluorescence resonance energy transfer (FRET) mechanism, with a linear recognition range of 0-0.2 mM and a low detection limit (LOD) of 0.0197 μM, but also shows fluorescence enhancement (turn-on) for the detection of folic acid (FA) in water through host-guest interactions, and a linear relationship in the concentration range of 0-18 μM with a LOD of 0.0883 μM. This is the first time folic acid detection is carried out based on a Ln-MOF, and is also one of the very rare examples of application of white-light-emitting MOFs for fluorescence detection. Furthermore, interestingly, another fluorescence further enhanced (named turn-on plus) system was designed and successfully obtained by adding FA to the fluorescence quenched Eu0.06Tb0.04Gd0.9-DPNC@MnO4- system, in which the mechanism of further fluorescence enhancement can be ascribed to the redox reaction between MnO4- and FA under alkaline conditions and the production of another fluorescent compound. Additionally, the Boolean logic system was also constructed based on the dual-component analysis (MnO4- and FA) of Eu0.06Tb0.04Gd0.9-DPNC in water.
Bibliographic Details
Royal Society of Chemistry (RSC)
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