A pyrazine core-based luminescent Zr(iv) organic framework for specific sensing of Fe³⁺, picric acid and Cr₂O₇²⁻

Abstract

A new Zr-MOF incorporating a pyrazine core-based tetracarboxylate was used for selective fluorometric sensing of Fe3+, picric acid and Cr2O72− with outstanding sensitivity.

Tetraphenylpyrazine-Based Manganese Metal–Organic Framework as a Multifunctional Sensor for Cu2+, Cr3+, MnO4–, and 2,4,6-Trinitrophenol and the Construction of a Molecular Logical Gate

“…During the past decades, metal–organic frameworks (MOFs) emerged as a new type of inorganic–organic hybrid porous material and gained extensive attention because of their attractive properties including high specific surface area, tunable porosity, structural diversity, promising luminescence, etc. − Generally, MOFs were architected by a self-assembly process of metal ions and organic ligands using a hydrothermal method, and the topological structure and luminescent properties keep great relationships with the components of MOFs, such as the organic linker and metal node. , Thus, various ligands have been explored for architecting MOFs with the aim of obtaining a desired topological structure as well as improving the sensing properties. Among those organic linkers, poly­(carboxylic acid)­s attract much attention because of their attractive coordination diversities, which may facilitate the construction of attractive topological structures. ,− Besides, some other organic compounds with coordinated N atoms have also been designed and developed as linkers, for example, pyridine, imidazole, and triazole. ,,, Among these, multiimidazole-functionalized organic linkers were commonly used in MOF construction and produced interestingly and easily predicable topological structures because of their relatively simple coordination modes. − It is noted that functionalized tetraphenylpyrazine exhibit promising advantages in architecting MOF because the built-in Lewis N sites of pyrazine and the luminescent nature of tetraphenylpyrazine may facilitate their application in sensor design. ,− However, the utilization of multiimidazole-functionalized tetraphenylpyrazine for architecting MOF is seldom reported.…”

“…It is noted that a single MOF system with multiple functional detection capabilities exhibits high efficiency, as a result, developing MOFs as multifunctional sensors has attracted extensive attention. So far, some luminescent MOFs aimed at multiple targets have been reported. − Some of them also exhibit logical gate performances, showing promising applications in the construction of fluorescence-based molecular switches. − However, MOF-based sensors that show multitarget detection toward metal ions and anion as well as logical performances are remarkably rare, which may be ascribed to the elaborative design and tedious preparation procedure. Consequently, exploring such sensors with multitarget detection and constructing logical switches are challenging but of great significance.…”

A Zr-Based Metal–Organic Framework with a DUT-52 Structure Containing a Trifluoroacetamido-Functionalized Linker for Aqueous Phase Fluorescence Sensing of the Cyanide Ion and Aerobic Oxidation of Cyclohexane

“…The properties like luminescence, non-toxicity, wide range of chemical stability, diverse pore sizes, biodegradability, open metal-sites for interaction, and presence of different functional groups make MOFs good chemical sensors in real applications. , In recent decades, luminescent MOFs (LMOFs) have turned out to be an important category of compounds to detect different guest targets like small organic molecules, solvents, gases, cations, anions, explosives, and organic molecules. − In the presence of different analytes, luminescence of LMOFs may be increased (turn-on) or quenched (turn-off). This situation depends on the sensitivity of the reaction of analytes with probes. ,− …”

Influence of Hydrogen Bond Donating Sites in UiO‐66 Metal‐Organic Framework for Highly Regioselective Methanolysis of Epoxides

“…The shift in peak positions of symmetric and asymmetric carboxylate stretching vibrations as compared free carboxylic acid linker is due to the binding of carboxylates with Zr(IV) ions. The peak at 1656 cm −1 in as‐synthesized 1 is present due to the presence of guest DMF solvent molecules which originated from the reaction medium …”