A novel ratiometric fluorescent Yb3+ sensor based on a N′-(1-oxoacenaphthylen-2(1H)-ylidene)furan-2-carbohydrazide as a suitable fluorophore

Selective dispersive liquid–liquid microextraction and preconcentration of Ni(II) into a micro droplet followed by ETAAS determination using a yellow Schiff's base bisazanyl derivative

“…Under the specified experimental conditions, the calibration curve for Ni was linear from 10 to 50 ng mL − 1 . According to the definition of IUPAC, the limit of detection (LOD, 3σ) of this method was 0.04 ng mL − 1 [35,36]. The enrichment factor, calculated from the ratio of the sample solution volume of 5 mL and the sediment phase volume of 36 μL, was found to be 138 fold.…”

Macrocyclic anthracene-anchored calix[4]arene as a sensitive and selective fluorescent chemosensor for ytterbium ions

“…Furthermore, metallic ytterbium dust poses a fire and explosion hazard. [4] As a result, the design of selective and sensitive sensors for the low-level determination of Yb 3C is of considerable importance for the prevention of environmental pollution and the protection of human health. Today, different types of fluorescent receptors are known for the sensing of rare-earth metals.…”

“…[5][6][7] However, they often show fluorescence quenching (turn-off) response. [4] Systems with turn-on fluorescence response especially for Yb 3C are still rare. [8] Calixarene-based chemosensors have been widely studied as a highly selective and sensitive detection technology.…”

“…Calixarenes are cyclic oligomeric structures and regarded as the third generation of host molecules because of their inclusion complexation ability with cations, anions, and neutral molecules. [9,10] Calix [4]arenes can be easily functionalized both at lower and upper rims. [11] Calixarenes have become important receptors in synthesis and applications as supramolecular platforms for molecular recognition, drug discovery, self-assembly, catalysis, nanotechnology and sensing.…”

“…partial cone and 1,2-alternate). [15] In addition, it provides excellent topological advantages because it affords excellent cavities on same side of the calix [4]arene framework composed of the phenolic oxygen donor atoms and aromatic moieties. [16] Although preparation of bulky calixarene chemosensor in cone conformation is rare, its synthetic strategy is quite interesting.…”