A white-light-emitting lanthanide metal-organic framework for luminescence turn-off sensing of MnO and turn-on sensing of folic acid and construction of a "turn-on plus" system

A novel single-phase white-light-emitting microscale lanthanide metal-organic framework [Eu 0.06 Tb 0.04 Gd 0.9 (HDPNC) 1.5 (H 2 O)(DMF)]·2H 2 O (H 3 DPNC = 5-(3′,5′-dicarboxylphenyl) nicotinic acid) abbreviated as Eu 0.06 Tb 0.04 Gd 0.9 -DPNC was obtained successfully under 365 nm excitation, by ad...

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Published in:New journal of chemistry 2020-07, Vol.44 (25), p.1239-1249
Main Authors: Dong, Zhen-Peng, Zhao, Fei, Zhang, Lei, Liu, Zhi-Liang, Wang, Yan-Qin
Format: Article
Language:English
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Summary:A novel single-phase white-light-emitting microscale lanthanide metal-organic framework [Eu 0.06 Tb 0.04 Gd 0.9 (HDPNC) 1.5 (H 2 O)(DMF)]·2H 2 O (H 3 DPNC = 5-(3′,5′-dicarboxylphenyl) nicotinic acid) abbreviated as Eu 0.06 Tb 0.04 Gd 0.9 -DPNC was obtained successfully under 365 nm excitation, by adjusting the molar ratio of Ln 3+ 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 (Eu 0.06 Tb 0.04 Gd 0.9 -DPNC), acting as an effective fluorescent platform, not only exhibits notable fluorescence quenching (turn-off) toward MnO 4 − 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 Eu 0.06 Tb 0.04 Gd 0.9 -DPNC@MnO 4 − system, in which the mechanism of further fluorescence enhancement can be ascribed to the redox reaction between MnO 4 − 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 (MnO 4 − and FA) of Eu 0.06 Tb 0.04 Gd 0.9 -DPNC in water. A white-light-emitting lanthanide MOF shows recyclable and dual-responsive sensing for MnO 4 − and folic acid in an aqueous system with high selectivity and sensitivity.
ISSN:1144-0546
1369-9261
DOI:10.1039/d0nj02145h