A fluorescent ratiometric nanosized system for the determination of Pd^II in water

Abstract

The fluorescent ligand (L) based on the N2S2 pyridinophane macrocycle and the 7-nitrobenzo[1,2,5]oxadiazole (NBD) fluorogenic fragment has been synthesized to coordinate Pd(II) ions. Loaded on dye-doped silica nanoparticles, L can be used as a ratiometric fluorescent chemosensor for Pd(II) in water with high selectivity toward other metal ions including the platinum group ones.

Highly stable ionic liquid-in-water emulsions as a new class of fluorescent sensors for metal ions: the case study of Fe3+ sensing

“…This can be explained by considering that at this pH value oleate is in its deprotonated form and can interact both with the neutral NEA to form (NEA)/(OAc À ) droplets and with Na + to form worm-like micelles of sodium oleate in accordance with the data previously reported in the literature. 34 Following our interest in the development of uorescent sensors for metal ions recognition in water, [35][36][37][38][39][40][41] we investigated the behaviour of this unique IL-in-water uorescent emulsion in the presence of different metal ions. Interestingly, although some metal ions (Al 3+ , Ga 3+ , Ni 2+ , Pb 2+ , Zn 2+ ) caused an enhancement in the intensity of the emission of the emulsion, only upon addition of Fe 3+ we observed a dramatic quenching of the uorescence (Fig.…”

A Water‐Soluble ESIPT Fluorescent Probe with High Quantum Yield and Red Emission for Ratiometric Detection of Inorganic and Organic Palladium

“…Chemosensors for palladium are based on fluorescein and rhodamine fluorophores, possess small Stokes shifts, and give emission in the visible region; thus, they may result in difficulties in the quantitative determination and bioimaging of palladium due to the excitation interference and photo‐damage 7b–e. Moreover, these on–off and off–on probes are significantly influenced by environmental effects and excited energy,7f–h while ratiometric probes can avoid interference from factors such as probe concentration, photobleaching, the instrument’s sensitivity, and environmental effects 8. With these considerations in mind, we set out to develop a ratiometric fluorescent probe for palladium species that would function in an absolute aqueous medium with large Stokes shifts and long wavelength emission.…”

Can Serendipity Still Hold Any Surprises in the Coordination Chemistry of Mixed-Donor Macrocyclic ligands? The Case Study of Pyridine-Containing 12-Membered Macrocycles and Platinum Group Metal ions PdII, PtII, and RhIII

“…In this context, we have been engaged in the development of mixed N/O/S-donor macrocycles featuring rigid heterocyclic moieties, such as pyridine (py) [13][14][15][16][17][18][19][20][21], and 1,10phenanthroline (phen) [22][23][24][25][26][27][28][29][30][31] as integral parts of the macrocyclic structure, which is completed by an aliphatic portion carrying different donor atoms. These systems proved to be highly efficient and selective ionophores in solid-phase extraction, selective transport, preparation of PVC-based ion-selective electrodes, and fluorimetric chemosensors for some transition and heavy metal ions.…”