Two Amino-Decorated Metal–Organic Frameworks for Highly Selective and Quantitatively Sensing of Hg^II and Cr^VI in Aqueous Solution

Abstract

Two amino-decorated metal-organic frameworks have been constructed, which are the rare examples of MOF-based fluorescent probes targeting environmentally relevant guest species, such as Hg (II) and Cr (VI) ions in aqueous solution, with high selectivity and sensitivity. The possible sensing mechanism is also discussed.

A Water‐Stable Uranyl Organic Framework as a Highly Selective and Sensitive Bifunctional Luminescent Probe for Fe3+ and Tetracycline Hydrochloride

“…And the lower the LUMO orbitall evel of antibiotics, the easier the electron transfer was, and the more pronounced the fluorescenceq uenching effect. [40][41][42] Therefore, the reduction potentialofa ntibiotics was determined by electrochemical cyclic voltammetry (Figure S12-S18)a nd used the formula LUMO = À(4.4 + E red onset + E Fc/Fc +)t oo btain the LUMO orbital energyl evel. [43,44] The test results exhibit that the order of antibiotic LUMO orbital level wasT CH < PC % AZ % ACT < SDZ < CF ( Figure 10 and Ta ble S3), and the LUMO orbital level of tetracycline hydrochloride was significantly lower than other antibiotics.…”

A Terbium Metal–Organic Framework for Highly Selective and Sensitive Luminescence Sensing of Hg2+ Ions in Aqueous Solution

“…Thus,e xploring novel MOFs with good water stability and outstanding sensing properties is urgently needed. Given that the mercury ion has ah igher affinity to nitrogen atoms and al arger ionic radius than other metal ions, [13,15] the sensoryproperties can be enhanced by introducing amelamine group into framework owing to the optimal interactional space between triazine and imino for Hg 2 + . [16] Herein, we chose an unique organic ligand 4,4',4''-s-triazine-1,3,5-triyltri-paminobenzoic acid( H 3 TATAB, Scheme 1) to construct al anthanide metal-organic framework Tb(TATAB)·(DMF) 4 (H 2 O)(MeOH) 0.5 (TbTATAB) for Hg 2 + sensing.…”

Luminescent Metal–Organic Framework Thin Films: From Preparation to Biomedical Sensing Applications

“…The fluorescence quenching shows a linear correlation in the Hg 2+ concentration range from 0.1 to 10 μM with the calculated limit of detection (LOD) of 6 nM. In addition, amino [111], triazole unit [112], sulfone [113] and thiol [114] are introduced into MOFs for Hg 2+ sensing.…”

“…Hg 2+ is among the most toxic metal ions, which is harmful to humans and can cause many diseases, such as digestive, kidney, and neurological diseases, even in a very low concentration. It is very difficult to be replaced in a short period of time when mercury enters the human body [107][108][109][110][111][112][113][114]. As for Cr 3+ , a trace amount of Cr 3+ is necessary and has a huge impact on the metabolism of carbohydrates, fats, proteins, and nucleic acids.…”