Table of content: Herein, a novel, effective, and environmentally friendly one-pot methodology for the synthesis of α-bromoacetophenones has been developed for the regioselective α-monobromination of aromatic carbonyl compounds with bromod...
Dye‐linked Upconverting Nanophosphor‐based Ratiometric Chemosensor for NIR‐excited and FRET‐mediated Ultrasensitive Detection of Sulfide Ions
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Ratiometric chemosensor (UCNP@PAA-RBD-Sn2+) for FRET based S2− ions sensing following NIR light irradiation. This sensor and technique provides high selectivity and ultra-sensitivity towards the S2− ions, with a limit of detection (LOD) of 0.03 μM, which is far lower than WHO allowed contamination limit and previously reported probes for the same.
In this article, a NIR-excited ratiometric method for selective and ultrasensitive detection of sulfide (S2−) ions in an aqueous environment is presented, which is reliant on fluorescence resonance energy transfer (FRET). The chemosensor-design is based on an upconverting nanophosphor (UCNP)-linked coloured complex between a rhodamine-B derivative and stannous ions (RBD-Sn2+). Under the excitation of NIR light, the green emission of UCNP (at 542 nm) is reabsorbed by the linked RBD-Sn2+ complex via FRET, which in turn emits in the orange (at 582 nm). S2− ions specifically interact with the linked RBD-Sn2+ complex and quantitatively bleach its colour, leading to reduction in FRET and consequent recovery of the green emission of UCNP. We investigated the quantitative and ratiometric detection of S2− ions in aqueous phase using this NIR-excited FRET-based approach. The concentration of S2− ions is quantitatively connected to the ratiometric emission signal under NIR excitation. We have found that the detection limit for S2− ions using our FRET-based nanoprobe is around ten times lower than that of colorimetric or fluorescence-based approaches. Owing to the use of NIR-light as excitation source, our proposed sensor can demonstrate background-free sensing of S2− in complex environmental and biological samples.Zum Volltext
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