Coumarin-embedded MOF UiO-66 as a selective and sensitive fluorescent sensor for the recognition and detection of Fe³⁺ ions

Abstract

A fluorescent composite, HCAA@UiO-66, was prepared by encapsulating fluorescent 7-hydroxycoumarin-4-acetic acid (HCAA) molecules into pore of metal-organic framework (MOF, UiO-66). The encapsulating of HCAA in the pore of UiO-66 does...

Porous Organic Frameworks Constructed by the Synergetic Effect of Covalent Bonds and Hydrogen Bonds for the Selective Identification and Detection of Explosives

“…All explosives have very weak absorbance at 292 nm except for 4-NP, which has a very strong absorption at the excitation wavelength of 292 nm for the measurement of all fluorescence spectra. In other words, the excitation energy for fluorescence emission of CHOF-1 was competitively absorbed by 4-NP, and thus the fluorescence was reduced, which is consistent with the reported absorption competition quenching (ACQ) mechanism. − Third, the weak absorbance at 292 nm of TNP also rules out its competitive absorbance with excitation energy for fluorescence emission. The nitro units, especially three nitro units on the TNP molecule, increase the acidity of the phenol units, as well as its ability to form hydrogen bonds .…”

A novel 2D metal–organic framework probe: a highly sensitive and visual fluorescent sensor for Al3+, Cr3+ and Fe3+ ions

“…[32][33][34][35] For instance, the Feng group reported a dye-dispensed HCAA@UiO-66, which displayed a rapid, selective and sensitive fluorescence quenching response towards Fe 3+ with a detection limit of 8.45 Â 10 À5 mol L À1 . 36 Based on a proton transfer mechanism, the Meng group presented a Zn-MOF to detect Cr 3+ ions sensitively and selectively. 37 The ''turn-off'' sensors are vulnerable to interference by background signals, resulting in their poor performance in real detections.…”

Design and Synthesis of Four Newly Water-Stable Pb-Based Heterometallic Organic Frameworks: How Do the Second Metals (Zn, Cd, Co, and Mn) Optimize Their Fluorescent and Catalytic Properties?

“…30 Significantly superior to traditional luminescent materials, the emerging MOF materials have shown their unique merits, such as a lower limit of detection (LOD) and higher sensitivity. 31,32 Therefore, the lanthanide and d 10 -metal MOFs and the d−f HMOFs have been studied extensively. 33−35 However, there are few reports on the application of d−p mixed HMOFs.…”

“…Therefore, the detection of NB must be taken seriously . Significantly superior to traditional luminescent materials, the emerging MOF materials have shown their unique merits, such as a lower limit of detection (LOD) and higher sensitivity. , Therefore, the lanthanide and d 10 -metal MOFs and the d–f HMOFs have been studied extensively. − However, there are few reports on the application of d–p mixed HMOFs. Besides, as the first and foremost environmental problem at present, the emission and transformation of CO 2 is an urgent issue to be solved. , Coupling CO 2 with various epoxides to prepare high-value carbonates is a strategy to turn waste into a valuable product .…”