A dual intensity and lifetime based fluorescence sensor for perrhenate anion

Luminescent 2D Pillared-Bilayer Metal–Organic Coordination Networks for Selective Sensing of ReO4–in Water

“…This is the first example where neutral coordination networks were being used for the detection of ReO 4 – in water. In the literature, there are only two cationic MOFs reported for the detection of ReO 4 – in aqueous media. , As shown in Table S3, the detection limits for 1 and 2 are comparable to those by inorganic probes ,, but are higher than many organic probes reported in the literature. − …”

“…There are two major approaches employed in dealing with radioactive anions, namely, sequestration/removal of anions and single-molecule sensing. − The latter is less explored. Many quantitative and qualitative techniques such as adsorption and ion-exchange methods have been utilized for the detection and estimation of such toxic pollutants. − However, current technical methods for effective detection are time-consuming and expensive.…”

An Unusual Bismuth–Antimony–Europium Cluster-Imbedded Polyoxotungstate and Its Bidirectional Luminescence Detection

“…The apparent lifetime alterations of 1 in the presence and absence of Mn 2+ ions are suggestive of a dynamic quenching process. It shows that the quenching mechanism is the result of the dynamic collision between Mn 2+ ions and the polyoxoanions of 1 rather than the combination of Mn 2+ and the polyoxoanions of 1 . − Besides, the UV–vis spectrum of Mn 2+ overlaps with in some degree the excitation spectrum of 1 , implying the competitive photon energy absorption between the polyoxoanions of 1 and Mn 2+ cations (Figure S25). , Consequently, the PL gradual quenching mechanism of the 1 -based sensor upon augmenting the Mn 2+ concentration is probably related to dynamic quenching and competitive energy absorption.…”

“…When the used minimum concentration of CO 3 2– anions was introduced to the 1 -based Mn 2+ quenching system, according to the K SP of MnCO 3 , the concentration of Mn 2+ cation in the system is calculated as 1.49 × 10 –6 M. The limit concentration of MnCO 3 precipitation observed by human eyes is 8.70 × 10 –5 M. Therefore, although there is the MnCO 3 precipitation in the system, we cannot directly observe it. In addition, the PL lifetime of the 1 -based Mn 2+ -quenching system was also examined upon raising the CO 3 2– concentration, which dramatically increases from 40.73 to 316.76 μs with the CO 3 2– concentration rising from 0 to 240 μM (Figure S28, Table S10), because CO 3 2– and Mn 2+ are combined to form MnCO 3 , reducing dynamic collision probability of Mn 2+ ions with the polyoxoanions of 1 in the 1 -based Mn 2+ -quenching system. ,, Therefore, the PL recovery of the 1 -based Mn 2+ -quenching system may be related to the removal of Mn 2+ ions from the system to produce MnCO 3 precipitation.…”

“…In addition, the PL lifetime of the 1-based Mn 2+ -quenching system was also examined upon raising the CO 3 2− concentration, which dramatically increases from 40.73 to 316.76 μs with the CO 3 2− concentration rising from 0 to 240 μM (Figure S28, Table S10), because CO 3 2− and Mn 2+ are combined to form MnCO 3 , reducing dynamic collision probability of Mn 2+ ions with the polyoxoanions of 1 in the 1-based Mn 2+quenching system. 48,57,58 Therefore, the PL recovery of the 1based Mn 2+ -quenching system may be related to the removal of Mn 2+ ions from the system to produce MnCO 3 precipitation.…”