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

Abstract

A novel fluorescent probe with a high quantum yield (0.41), large Stokes shifts (255 nm), and red emission (635 nm) was designed to detect all typical oxidation states of palladium species (0, +2, +4) by palladium-mediated terminal propargyl ethers cleavage reaction in water solution without any organic media. The probe showed a high selectivity and excellent sensitivity for palladium species, with a detection as low as 57 nM (6.2 μg L(-1)).

Excited-state intramolecular proton-transfer (ESIPT) based fluorescence sensors and imaging agents

“…In the case of Pd 2+ , excellent selectivity and high sensitivity was seen with a LOD = 57 nM being recorded in a purely aqueous medium. 66 Scheme 16 A single fluorescent ESIPT probe 15 with the ability to distinguish between Fe 3+ , Cr 3+ , and Al A different approach to palladium sensing was introduced by Liu et al These researchers developed an allyl containing ESIPT dimethylamino-flavone probe 22 with the ability to detect a range of palladium (0, +2, and +4) species (Scheme 21). Probe 22 was found to react with Pd(0) in a 1 : 1 stoichiometry.…”

Hollow nanoreactors for Pd-catalyzed Suzuki–Miyaura coupling and O-propargyl cleavage reactions in bio-relevant aqueous media

“…64 Given their low toxicity, we studied their catalytic activity in cellular environments. With this purpose, we performed the depropargylation of the probe HBTPQ (8) 66 in the presence of Vero mammalian cells.…”

Straightforward convergent access to 2-arylated polysubstituted benzothiazoles

“…[8][9][10] Similar to other benzazoles, [11][12][13][14] they quite commonly exhibit interesting photochemical properties including processes such as Excited State Intramolecular Proton Transfer (ESIPT). [15,16] These molecules have also been intensively studied for their dual action potential as metal chelators and as intercalating compounds targeting pathological peptidic aggregates that of interest for imaging various dementias e.g. Alzheimer's Disease.…”