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

Abstract

A series of isomorphic lanthanide metal-organic frameworks (MOFs) Ln(TATAB)⋅(DMF) (H O)(MeOH) (LnTATAB, Ln=Eu, Tb, Sm, Dy, Gd; H TATAB=4,4',4''-s-triazine-1,3,5-triyltri-p-aminobenzoic acid) have been solvothermally synthesized and structurally characterized. Among these MOFs, TbTATAB exhibits good water stability and a high fluorescence quantum yield. Because mercury ions (Hg ) have a high affinity to nitrogen atoms, and the space between multiple nitrogen atoms from triazine and imino groups is suitable for interacting with Hg ions, TbTATAB shows highly selective and sensitive detection of Hg in aqueous solution with a detection limit of 4.4 nm. Furthermore, it was successfully applied to detect Hg ions in natural water samples.

Multiple Magnetic Relaxation Pathways and Dual‐Emission Modulated by a Heterometallic Tb‐Pt Bonding Environment

“…Therefore new ligands, which act as antennas, are needed for efficient energy transfer to Ln ions; for Ln emission. π‐conjugated systems serve as typical molecular antennas because they have high absorption coefficients in UV or visible light and efficiently transfer excitation energy to Ln ions –. Metal complexes can also be used for absorbing visible light and transfer the energy …”

A Two‐Dimensional Metal–Organic Framework as a Fluorescent Probe for Ascorbic Acid Sensing

“…Compared with other luminescent materials, MOFs can provide a greater number of rich luminescent centers, such as metal ions, organic linkers, and guest molecules . Luminescent MOFs have become a new type of sensing material owing to their tunable pore sizes and functionalized pore surfaces, and they have been applied as luminescent sensors to detect environmental toxins, biomolecules, explosives, ionic species, and many others . In recent years, some MOF‐based AA sensors have been reported.…”

Two Highly Stable Luminescent Lead Phosphonates Based on Mixed Ligands: Highly Selective and Sensitive Sensing for Thymine Molecule and VO3– Anion

“…The K sv value is calculated as 7.35 × 10 3 M –1 for compound 2 , which has a strong quenching effect (Figure 10c). 48 To further study the interaction between compound 2 and VO 3 – anion, we added compound 2 to the other fifteen kind of ion solutions and then added VO 3 – anion to the mixed solutions. As a result, the intensity of emission peak for compound 2 quickly reduces upon further addition of VO 3 – (Figure 10d).…”