Design of “turn-off” luminescent Ln-MOFs for sensitive detection of cyanide anions

Abstract

Two novel 2D lanthanide metal-organic frameworks (Ln-MOFs), namely {[Eu2(DBTA)3(DMF)2]·DMF}n(1), {[Tb2(DBTA)3(DMF)2]·DMF}n(2), (H2DBTA=2,5-Dibromoterephthalic acid) have been successfully synthesized by the solvothermal method. Single-crystal X-ray diffraction results proved that the complexes possess the...

Multifunctional Luminescent 3D Ln-MOFs with High Sensitivity for Trace Detection of Micronutrients

“…However, the fluorescence detection of Ln-MOFs materials is still in the preliminary stage. So far, a variety of Ln-MOFs have been developed, and their unique antenna effects, high quantum efficiency, fluorescence monochromator, narrow emission bands, sharp characteristic emission peaks, long excited state lifetimes (>Ms) and significant Stokes shifts (>200 nm) have attracted extensive attention from researchers. − They have successfully applied Ln-MOFs to many fields, such as heterogeneous catalysis, gas storage/separation, proton conduction, light-emitting devices, and more. − However, in various applications, fluorescence detection based on chemical sensing is the best choice for rapid identification and detection of ions, small molecules and vapors. , In comparison with conventional detection strategies, fluorescence detection displays many merits, e.g., high sensitivity, nondestructive, good selectivity, and practicability …”

Expanding the Library: Twenty New Ln(III) Metal–Organic Frameworks, Including Two Isoreticular Pairs, from Dihaloterephthalic Acid

“…Inspired by the results with the tetrahalogenated systems, we transition in this contribution to dihalogenated terephthalates and explore the coordination chemistry of Ln(III) with 2,5-dihaloterephthalate ligands (DXTA, where X = Cl and Br). There are only 2 hits for Ln-DClTA , and 7 for Ln-DBrTA − compounds in the CSD, so there is significant room for expansion of the library of Ln-haloterephthalate compounds. The immense potential of DXTA ligands to generate structural diversity is evident from the range of possible metal–ligand coordination modes shown in Figure and Table .…”

Highly pH-stable lanthanide MOFs: a tunable luminescence and ratiometric luminescent probe for sulfamethazine

“…First, based on the hard-soft acid-base theory, Ln 3+ ions have obvious oxophilicity, and prefer to coordinate with oxygen-containing ligands (-COOH, -PO 3 H 2 ). [47][48][49] Second, emissions of the Ln 3+ ions are extremely weak due to the low molar absorptivity and Laporte forbidden f-f electronic transitions. 41 Then, the organic aromatic ligands containing π-electron conjugation systems can serve as "antenna" or sensitizers, effectively transferring absorbed energy to Ln 3+ ions through "antenna effects" and enhancing the luminescence of Ln-MOFs.…”