A Selective and Sensitive “Turn‐on” Fluorescent Chemosensor for Recognition of Hg²⁺ Ions in Water

Abstract

Based upon highly selective and irreversible Hg2+‐promoted deprotection of the dithioacetal reaction, a new water‐soluble “turn‐on” fluorescent chemosensor (1) was prepared and exhibited high selectivity and sensitivity towards the Hg2+ ion over other heavy and transition‐metal ions in pure water by transforming a weakly fluorescent precursor (colorless) to a highly fluorescent aldehyde (yellow–green; see figure) with a 155‐fold increase in fluorescent intensity.

Multimodal Use of New Coumarin‐Based Fluorescent Chemosensors: Towards Highly Selective Optical Sensors for Hg2+ Probing

“…Several types of sensing molecules with fluorescent switching properties have been developed and examined to signal Hg 2 + binding. [9][10][11][12][13][14][15][16] However, examples of easy to handle fluorescence devices for in-field Hg 2 + detection and screening in environmental and industrial samples are much fewer. [17] In fact, the development of these systems generally requires the overcoming of many practical/technical problems inherent in the immobilization of the fluorescent molecular sensor on/in appropriate supports.…”

Luminescent chemosensor for Hg2+ ion based on a dinuclear Ru(II) complex containing open chain azacrown ether

“…In this context, the luminescent sensors for Hg 2+ were developed quickly due to their advantages such as high sensitivity, good selectivity, quick response, and local observation [12][13][14][15][16]. On the other hand, different sensing mechanisms were reported for Hg 2+ luminescent probes [17][18][19][20]. Most of the rhodamine based sensors follow the approach of ''spirolactam ring opening" for the detection of mercury ions [17].…”

“…A polymer based luminescent sensor incorporating triazole unit for Hg 2+ detection via click reaction [19]. One sensor reported by Xu et al was designed based on a Hg 2+ -promoted deprotection reaction of the dithioacetal by transforming a weakly fluorescent precursor (colorless) to a highly fluorescent aldehyde product [20]. Although a variety of organic molecules and polymers were used as luminescent indicators for Hg 2+ sensing with different mechanisms, some of them usually suffer from the water-fast, complicated synthesis, small Stokes' shifts, limited photostability, and necessary hydrolysis [21][22][23].…”

Detection of Hg2+ and F− Ions by Using Fluorescence Switching of Quantum Dots in an Au‐Cluster–CdTe QD Nanocomposite

“…[39][40][41][42] Various ligands, molecular beacons, and hybrid probes have also been used for the detection of two cations. [43][44][45][46] Recently, Willner et al [47] have published a nicely written review on optical molecular sensing with semiconductor quantum dots. However, a single QDs-clusterbased probe that can detect both Hg 2 + cation and F À anion is not yet known.…”