Novel “Turn-On” Fluorescent Probe for Highly Selectively Sensing Fluoride in Aqueous Solution Based on Tb³⁺-Functionalized Metal–Organic Frameworks

Abstract

A Zr-based metal–organic framework (Zr-MOF) which has free carbonyl groups is synthesized successfully through mix-ligand strategy. Subsequently, Tb 3+ is encapsulated into a Zr-MOF by postcoordinated modification. The Tb 3+ @Zr-MOF exhibits the characteristic emission of Tb 3+ because of efficient sensitization through antenna effects. The Tb 3+ @Zr-MOF is further developed as a novel “turn-on” fluorescent probe to detect fluoride ions in aqueous solution. The results show that Tb 3+ @Zr-MOF exhibits excellent selectivity, high stability, low detection limits, and good anti-interference for sensitizing fluoride ions. In addition, the possible sensing mechanism that the induced luminescence properties may be attributed to Lewis acid–base interactions is discussed.

3D Cadmium(II)‐Based Coordination Polymer Constructed from V‐Shaped Semirigid Ligand: Selective Detection of Oxoanion Pollutants CrO42–, Cr2O72–, MnO4– in Water

“…Compared to instrumental analysis, such as ion chromatography, inductively coupled plasma‐mass spectrometry, fiber optic wave sensors, coupled with atomic absorption spectrometry,chemical methods including fluorescent and colorimetric methods, typically take shorter processing time and less sample pretreatment works . Moreover, luminescent coordination polymers (CPs) have been widely studied as chemical sensors owing to their significant advantages, namely, high selectivity, high sensibility, short response time, easy to operate and visualization …”

A Boric Acid-Functionalized Lanthanide Metal–Organic Framework as a Fluorescence “Turn-on” Probe for Selective Monitoring of Hg2+ and CH3Hg+

“…Metal–organic frameworks (MOFs) have emerged as a class of promising and unique materials owing to their high porosity and large surface area. , MOFs have shown potential applications in the fields of gas storage, , separation, , sensors, − drug delivery, , catalysis, and biomimetics. − Especially, lanthanide MOFs (Ln-MOFs), formed by coordination of lanthanide metal ions to organic ligands, are generally preferred to construct skeletal materials having luminescent properties. − Luminescent Ln-MOFs exhibit unique fluorescent properties, such as large Stokes shifts, long fluorescence lifetime, narrow emission spectra, etc. On the basis of these unique advantages, Ln-MOFs have drawn great attention for sensing applications. − It has been previously reported that MOFs functionalized by NH 2 or SH groups are high-efficiency probes for Hg 2+ detection due to the interaction between Hg 2+ ions and N, S. − However, these methods are based on the coordination of Hg 2+ to amino or thiol groups, and other metal ions having similar electronic shell structures can influence detection . Most importantly, although CH 3 Hg + showed much more toxicity than Hg 2+ , few probes have been reported for the detection of CH 3 Hg + , especially the simultaneous detection of Hg 2+ and CH 3 Hg + .…”

Recent Progress in Metal–Organic Framework (MOF) Based Luminescent Chemodosimeters

“…In the past decades, numerous fluorescent probes have been developed for fluoride based on different fluoride-participated processes, such as fluoride-induced Si−O or Si−C bond cleavage, H−F hydrogen bonding formation, and Lewis acid−base interactions [136,137,138]. By exploiting these special reactivities of fluoride, several MOF-based luminesscent probes have recently been developed for its detection [139,140].…”