A water-stable zinc(ii)–organic framework as a multiresponsive luminescent sensor for toxic heavy metal cations, oxyanions and organochlorine pesticides in aqueous solution

Abstract

A water-stable metal–organic framework exhibits multiresponsive fluorescence sensing for Fe(iii), Cr(iii/vi), and Mn(vii) ions and the organochlorine pesticide 2,6-Dich-4-NA in aqueous solution.

A self‐penetrating and chemically stable zinc (ii)‐organic framework as multi‐responsive chemo‐sensor to detect pesticide and antibiotics in water

“…[ 45–47 ] And the LOD of NUC‐6 is lower than those of well‐designed CPs used for the detection of DCN in aqueous solutions, indicating the good detection effect of NUC‐6 (Table S3). [ 48–50 ] Here, the anti‐interference studies of DCN in the presence of other interfering pesticides were verified by mixing 0.5 ml 1 mM DCN and 0.5 ml 1 mM interfering pesticides. As expected, the result in Figure 3 shows the initial emission intensities of NUC‐6 getting trivially affected.…”

Fluorescence-Based Sensing of Pesticides Using Supramolecular Chemistry

“…In another example, a zinc-containing, water-soluble MOF was used to bind a variety of common contaminants, including heavy metals, anions, and 2,6-dichloro-4-nitroamine, a nitroaromatic compound with insecticidal activity (Xu et al, 2019c). All of the guests led to quenching of the MOF's fluorescence emission, an effect that was attributed to proximity-induced fluorescence resonance energy transfer (Wang et al, 2019b). Because such energy transfer requires spectral overlap between the emission spectrum of the energy donor and the absorption spectrum of the acceptor (vide supra), high levels of selectivity were observed (i.e.…”

A Highly Stable Multi-response Zirconium(IV) Metal-Organic Frameworks for Fluorescence Sensing of Fe3+, Cr2O72- and Organic Small Molecules

“…Moreover, The competition between absorption and emission spectra is also one of the causes of fluorescence quenching. [65] There is partial overlap between the absorption spectrum of each analyte (including Fe 3＋ , Cr Othan acetone, CCl 4 and xylene for Zr-MOF. In addition, for Fe 3＋ , it is also possible that the electron transfers from Zr 4 ＋ to Fe 3 ＋ in the Zr-MOF framework, which results in the decrease of the density of Zr-MOF electron cloud and the fluorescence quenching.…”

“…Of course, MOFs have also attracted more and more attention for fluorescent sensing material, especially, the stability, sensitivity and functional selectivity of fluorescent MOFs are the key to promote its application in water. [5][6][7][8][9][10][11][12][13][14] Currently, MOFs can be used as fluorescence probe to detect Fe 3＋ , [15][16][17][18][19] Fe 2＋ , [20][21] Al 3＋ , [22] Cu 2＋ , [23][24] Mg 2＋ , [25] Cd 2＋ , [26][27] Cr 3＋ , [28][29] Pb 2＋ , [30] Ce 3＋ , [31] Hg 2＋ , [32] etc, And it can also be used to detect anions, such as 3 4 PO -, [33][34][35] 2 2 4 H PO -, [36][37] 2 2 7 Cr O -, [38] 4 MnO -, [39] 2 3 CO -, [40] ClO -/SCN -, [41] 2 6 SiF ,…”