The construction of a multifunctional luminescent Eu-MOF for the sensing of Fe³⁺, Cr₂O₇²⁻ and amines in aqueous solution

Abstract

A water stable Eu3+-organic framework (1-Eu), [Eu(HL)(H2L)]·7.5H2O (H3L = 3-(3,5-dicarboxylphenyl)-4-carboxylpyridine) was constructed through solvothermal synthesis and studied by structural analyses and luminescent sensing. Crystallographic studies revealed that 1-Eu was a...

Hydrogen-Bond-Connected 2D Zn-LMOF with Fluorescent Sensing for Inorganic Pollutants and Nitro Aromatic Explosives in the Aqueous Phase

“…Metal ions have played an important role in the development of human society for a long time. For example, Fe 3+ , an essential component of hemoglobin, undertakes the duty of oxygen transportation in human body and plays a momentous role in agriculture and industry. − As a potential carcinogen, Cr 6+ also plays an important role in industrial production processes such as ferrochromium smelting, metallurgy, and so forth. − As a result, untreated factory wastewater usually contains these two ions, which cannot be biodegraded and are likely to be enriched in the environment and eventually enter the human body through the food chain, , causing different kinds of diseases. − Therefore, monitoring of Fe 3+ and Cr 2 O 7 2– pollutants is necessarily required because of its enrichment in the environment.…”

Metal–Organic Framework-Based Selective Molecular Recognition of Organic Amines and Fixation of CO2 into Cyclic Carbonates

“…Based on the aforementioned mechanistic findings, we can argue that PET and RET are not the sole reasons to define the fluorescence quenching mechanism of amine sensing. Finally, we reason that the quenching of the fluorescence intensities of Zn-MOF- 1 and Cd-MOF- 2 with the studied amines might be mainly instigated by the hydrogen-bonding and π–π interactions between aromatic amines and the host framework structure. − …”

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

“…Under excitation at 303 nm, the emission spectrum of 1 exhibits typical red luminescence of Eu 3+ ions at 578, 592, 619, 651, 687, and 698 nm, which are attributed to the 5 D 0 → 7 F J ( J = 0, 1, 2, 3, 4, 5) transitions. 69 2 emits characteristic green luminescence of Tb 3+ ions at 490, 546, 583 and 622 nm, which are attributed to the 5 D 4 → 7 F J ( J = 6, 5, 4, 3) transitions. 70 The remarkable luminescence of transitions was facilitated by the efficient transfer of energy from H 2 DBTA to Ln 3+ .…”