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A white-light-emitting lanthanide metal–organic framework for luminescence turn-off sensing of MnO4 and turn-on sensing of folic acid and construction of a “turn-on plus” system

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Abstract

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.

Graphical abstract: A white-light-emitting lanthanide metal–organic framework for luminescence turn-off sensing of MnO4− and turn-on sensing of folic acid and construction of a “turn-on plus” system

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Supplementary files

Article information


Submitted
28 Apr 2020
Accepted
14 May 2020
First published
15 May 2020

New J. Chem., 2020, Advance Article
Article type
Paper

A white-light-emitting lanthanide metal–organic framework for luminescence turn-off sensing of MnO4 and turn-on sensing of folic acid and construction of a “turn-on plus” system

Z. Dong, F. Zhao, L. Zhang, Z. Liu and Y. Wang, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ02145H

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