A Ratiometric Fluorescent Probe Based on RhB Functionalized Tb-MOFs for the Continuous Visual Detection of Fe3+ and AA

Abstract

In this study, a red-green dual-emitting fluorescent composite (RhB@MOFs) was constructed by introducing the red-emitting organic fluorescent dye rhodamine B (RhB) into metal-organic frameworks (Tb-MOFs). The sample can be used as a ratiometric fluorescent probe, which not only avoids errors caused by instrument and environmental instability but also has multiple applications in detection. The results indicated that the RhB@MOFs exhibited a turned-off response toward Fe3+ and a turned-on response for the continuous detection of ascorbic acid (AA). This ratiometric fluorescent probe possessed high sensitivity and excellent selectivity in the continuous determination of Fe3+ and AA. It is worth mentioning that remarkable fluorescence change could be clearly observed by the naked eye under a UV lamp, which is more convenient in applications. In addition, the mechanisms of Fe3+- and AA-induced fluorescence quench and recovery are discussed in detail. This ratiometric probe displayed outstanding recognition of heavy metal ions and biomolecules, providing potential applications for water quality monitoring and biomolecule determination.

A ratiometric fluorescence method based on silicon nanoparticles/o-phenylenediamine/MnO2 nanosheet systems for vitamin C detection

“…The linear range was 0.5 to 40 μM with a limit of detection (LOD) of 0.42 μM based on 3 σ /| K | ( σ was the standard deviation of the FL intensity ratio of ten blank solutions and | K | was the absolute value of the slope of the linear equation). Compared with a previous work for the ratiometric fluorescence detection of VC 37–40 (Table S2, ESI†), the method in this work possessed the advantages of simple preparation of fluorescent probes, mild operation conditions, high sensitivity and wide linear range.…”

Design and application of dual-emission metal–organic framework-based ratiometric fluorescence sensors

“…The complex was used as a ratiometric fluorescent probe for the detection of Fe 3+ and AA with high sensitivity and good selectivity. 51 Zhou's group prepared NH 2 -MOF by encapsulating the fluorescent dye eosin Y (EY) into an MIL-101 aluminum-based metal–organic framework (NH 2 -MOF) with ligand luminescence, and NH 2 -MOF could stably immobilize the EY molecules in the cavity and effectively inhibit the ACQ behavior of EY molecules. The obtained EY@MOF composites exhibited dual-emission fluorescence peaks at 437 nm and 565 nm, respectively, and could be used as a new type of ratiometric fluorescence sensor for the detection of arginine.…”

A Water‐Stable Europium Metal‐Organic Framework as a Turn‐Off Fluorescence Sensor for Ascorbic Acid Detection in Human Serum

“…[31] The low LOD suggests that Eu-NDBC is sensitive enough to alarm low plasma AA for some AAconcerning diseases. Compared to those reported AA fluorescence sensors (Table 1), the sensitive Eu-NDBC with LOD of 4.53 μM is lower than or comparable to those μM-level LODs, such as bovine serum albumin (6 μM), [32] terbium(III) chelating with 1,10-phenanthroline (74 μM), [33] CD-Fe 3 + (5 μM), [34] CsPbBr 3 / BSA NCs (28 μM), [35] CD-QD@SiO 2 (3.17 μM), [36] Cel-Au NCs (2.5 μM), [37] RhB@Tb-MOFs (2.54 μM) [38] and NF CDs (4.22 μM). [39] However, LOD of 4.53 μM is higher than those nM-level LODs, such as Cys-Au NCs (2.43 nM), [40] ProN6 (77.9 nM), [41] CNCs (0.15 nM), [42] and MN-CDs (0.03 μM).…”