Post-imparting Brønsted acidity into an amino-functionalized MOF as a bifunctional luminescent turn-ON sensor for the detection of aluminum ions and lysine

A novel aldehyde- and amino-functionalized luminescent metal-organic framework, Cd-TCHO, was constructed through the solvothermal reaction of 4,4',4''-tricarboxytriphenylamine, 2-amino-3-pyridinecarboxaldehyde and cadmium nitrate and was characterized. Post-synthetically oxidizing the aldehyde groups into carboxylate groups afforded a new complex, Cd-TCOOH, and this successful conversion process was confirmed by FT-IR and ¹H NMR studies. With the Brønsted acidic sites inside the cavities of Cd-TCOOH, it could be used as a luminescent sensor for Al³⁺ detection with a high selectivity and sensitivity (LOD = 0.54 ppb), which could be attributed to the coordination between free Brønsted acidic sites and Al³⁺. Importantly, it could also detect Lys among 20 kinds of natural amino acids; the selectivity, sensitivity and the sensing mechanism are discussed in detail. Also, both of the sensing processes were carried out in the HEPES buffer.

Exploring the multifunctionality in metal–organic framework materials: how do the stilbenedicarboxylate and imidazolyl ligands tune the characteristics of coordination polymers?

A synergistic effect causes MOF materials to demonstrate excellent iodine vapor retention and luminescence properties.

Two luminescent lanthanide–organic frameworks containing bithiophene groups for the selective detection of nitrobenzene and Fe3+

Two isostructural lanthanide–organic frameworks containing bithiophene groups can be used as fast-response fluorescent probes for the sensitive detection of nitrobenzene and Fe³⁺ ions through fluorescence quenching.

Computational screening of covalent organic frameworks for the capture of radioactive iodine and methyl iodide

Large-scale computational screening results show that COFs are promising materials for the capture of radioactive iodic contaminants from nuclear wastes.

Design and synthesis of luminescent porous coordination polymers for chromaticity modulation, sensing of nitrobenzene and iodine encapsulation

A family of porous coordination polymers constructed from C_2v symmetry ligands with increased conjugation moieties was systematically designed and prepared, which is highly promising for chromaticity modulation, sensing of nitrobenzene, and I₂ encapsulation.

A europium(iii)-based metal–organic framework as a naked-eye and fast response luminescence sensor for acetone and ferric iron

A europium(iii)-based MOF as an efficient dual sensor for acetone and Fe³⁺ detection, and the sensing mechanism of both is discussed.

Lanthanide-based metal–organic frameworks as luminescent probes

We discuss the construction of lanthanide-based metal–organic frameworks, their applications in possible detection mechanisms, and summarize some examples of Ln-MOFs as luminescent probes.