Design of a highly sensitive fluorescent sensor and its application based on inhibiting NaIO₄ oxidizing rhodamine 6G

Abstract

A novel fluorescent sensor has been designed for the determination of terbutaline sulfate (TBS).

One-Pot Synthesis of a Magnetic, Ratiometric Fluorescent Nanoprobe by Encapsulating Fe3O4 Magnetic Nanoparticles and Dual-Emissive Rhodamine B Modified Carbon Dots in Metal–Organic Framework for Enhanced HClO Sensing

“…The reason that the fluorescence of RhB-CDs was quenched by HClO might be that the RhB part in RhB-CDs was oxidized by HClO, and the π-electron density (δ) in the conjugated system decreased, thus causing the fluorescence quenching. , …”

“…The reason that the fluorescence of RhB-CDs was quenched by HClO might be that the RhB part in RhB-CDs was oxidized by HClO, and the π-electron density (δ) in the conjugated system decreased, thus causing the fluorescence quenching. 31,32 The parameters that may affect the reaction between the MOF-based nanoprobe and HClO, such as pH and incubation time, were optimized. The results were shown in Figure S5, and pH 4 and 2 min of reaction time were chosen as optimal conditions.…”

Engineering of Metal–Organic Frameworks as Ratiometric Sensors

“…As a result of the strong absorption capability of MOF, the intensity of fluorescence quenching (Δ F ) of MOF sensor was far larger as compared to the RhB-CDs. The quenching of fluorescence of RhB-CDs by HClO was possibly due to the fact that the RhB unit in RhB-CDs was oxidized by HClO thereby leading to the decrease in the π-electron density of the conjugated system. , To demonstrate the selectivity of modified the MOF sensor for HClO, numerous reactive oxygen and nitrogen species and in addition some common interferents were used. When 150 μM and 1 mM of HClO and interferents were added to the modified MOF sensor, huge fluorescence quenching was shown at 580 nm (Figure a), but only the addition of interferent showed practically no variation in the fluorescence ( F 415 / F 580 ).…”

Recent Advances in Preparation and Applications of Magnetic Framework Composites

“…The nanoprobe was applied to HClO sensing, which was dispersible and stable in aqueous solution. It is speculated that the sensing mechanism may be that HClO oxidizes the RhB part in RhB‐CDs, which reduces the π‐electron density in the conjugated system, resulting in the quenching of RhB‐CD fluorescence . The nanoprobe combines the advantages of MOFs, MNPs and ratiometric sensors with excellent adsorption capacity, magnetic separation, and eliminates changes in instrument and environmental instability.…”