A Water‐Stable Dual‐Channel Luminescence Sensor for UO₂²⁺ Ions Based on an Anionic Terbium(III) Metal–Organic Framework

Abstract

A stable 3D Tb -based metal-organic framework [Tb(BPDC) ]⋅(CH ) NH (DUT-101) was synthesized, and it is the first efficient dual-channel luminescence sensor for aqueous UO ions. DUT-101 contains an anionic three-dimensional framework and protonated dimethylamine molecules embedded within the channels. The intense green emission of DUT-101 could be highly selectively and sensitively quenched by UO ions even in the presence of other competing metal ions. A possible sensing mechanism was proposed based on both suppression of luminescence resonance energy transfer and enhancement of intermolecular electron transfer. Furthermore, visual green fluorescent test papers based on DUT-101 were fabricated and could be used to discriminate UO ions among various metal ions.

Preparation of Eu0.075Tb0.925-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe3+ and Cr2O72−

“…Ln-MOFs materials have outstanding luminescence characteristics; that is, they have the advantages of large Stokes shift, high quantum yield and luminescence intensity, narrow emission spectrum range, flexible coordination mode, and long luminescence life. MOFs fluorescent probes are commonly used as sensors [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Hna et al [26] synthesised Ce-MOF to detect Fe 3+ , and Gai et al [27] synthesised dual-sensor Eu-MOF to detect Fe 3+ and Cr 2 O 7 2− .…”

Metal–Organic Frameworks (MOFs) Based Analytical Techniques for Food Safety Evaluation

“…Two Europium-based MOFs (Eu-MOFs) were reported to have fascinating selectivity toward Fe 3+ and Cr 3+ with their excellent luminescence performance and high stability in water [34]. Another terbium MOF showed high selectivity and sensitivity toward mercury ions in aqueous solution [35]. Furthermore, calcium-, copper-and other metal-based MOF were successfully developed for the detection of pesticide, heavy metal, mycotoxin and related contaminants in real samples [36][37][38].…”

“…The excellent analytical performance of the core-shell structure UiO-66-NH 2 @PANI could be attributed to the chelation mechanism between Cd 2+ and amine groups on the electrode. Even with the presence of other ions, this modified electrode still displayed high sensitivity toward MOFs with desirable stability in a 3D dual-channel structure was designed [35]. DUT-101 demonstrated high selectivity and sensitivity toward trace amount of UO 2 2+ ions even in the mixture with different metal ions.…”

Exploiting a new europium(III) coordination polymer based on a zwitterionic ligand as a fluorescent probe for uranyl cations

“…21,23 The limit of detection (LOD, LOD = 3σ/slope, in which σ is the standard deviation of multiple measurements of a blank sample and the slope corresponds to the linear relationship between the fluorescence intensity) was calculated to be 1.95 µM, which is lower than those of the previously reported LnCP-or LnOF-based luminescent sensors. 18,19,22,23 Also the detection of uranyl cations needs to be improved, LnCP 1 still displays a good ability of the material to detect trace uranyl in water solution. As shown in Figure 2, the PXRD patterns of LnCP 1 treated by soaking in H 2 O or EtOH for 48 h were recorded.…”

“…There are a few reports describing the use of LnCPs to detect or uptake UO 2 2+ at low concentrations and with high sorption capacity and high sensitivity by fluorescence quenching. [18][19][20][21][22][23] One of the most important features for sensing uranyl cations is the abundance of open Lewis basic sites. 18 Encouraged by these earlier reports, we have synthesized two new LnCPs based on a novel zwitterionic N,N'-dipropionic acid imidazolium ligand as a more flexible organic linker, together with oxalic acid under hydrothermal conditions.…”