A study of the metal complexing of naphthalene-2,3-crown ethers using fluorescence spectroscopy: Part III

Cation Recognition with Fluorophore Crown Ethers

“…Erk et al have studied the synthesis and the steady-state fluorescence spectra of different aromatic crown ethers and their cation complexes in acetonitrile. − At room temperature benzocrowns exhibited typical ionophore behaviors on the cationic fluorescence spectra in acetonitrile as reported by Erk et al (Figure ) . The cation-binding studies exhibited good agreements with the cation radii and the type of counterion as well as the macrocycle size. − …”

“…The study of Yapar and Erk on 2,3-dioxanaphthalene crowns has shown their good sensor role for alkali metals. Ion binding is presented throughout CEQFS, where the counterions have less effect and the cation selectivities observed were mostly in accordance with the macrocycle size (Figure ) . However, large dibenzo-3 n -crown- n types of molecules were shown to properly display such a role…”

“…Such studies in acetonitrile showed, in particular, the validity of the fluorescence method to estimate selective cationic recognition even in the case of weaker cationic interactions. − …”

“…Erk et al have reported the serial work on the synthesis and the cationic recognition of different types of coumarin−crowns using steady-state fluorescence in AN (Figure ). − ,− …”

Bisquinolones as chiral fluorophores – A combined experimental and computational study of absorption and emission characteristics

“…In water, fluorescence was almost quenched (yield 0.1%) and furthermore -in contrast to 5 -blueshifted like all single carbostyrils. Addition of Li, Na, K, and Cs ions [22,23] did not change the absorbance and fluorescence values. Studies are ongoing to find response for organic ammonium ions.…”