A new metal sensory system based on intramolecular fluorescence quenching on the ionophoric calix[4]arene ring

Highly selective fluorescent chemosensor for Na+ based on pyrene-modified calix[4]arene derivative

“…The experimental dates could be well fitted using the nonlinear least-squares method [24] based on a "1︰1 host−guest stochiometry" model, and repeated as 1︰1 complex formation, thereby, the higher-order complexes could not be postulated. This was coincident with the reported results, and the tetraester groups at the low rim of calix [4]arene formed a 1︰1 stoichiometry complex with Na + [10][11][12][13][14]25] . We obtained the stability constant of compound 6 with sodium cation.…”

“…Shinkai and coworkers have designed a calix [4]arene having two pyrene moieties on the lower rim as fluorescent chemsensor for sodium ion based on the ratio of the monomer vs. excimer emission [10] . In a similar system, a calix [4] arene bearing pyrene (as a fluorophore) and nitrobenzene (as a quencher) was synthesized, which was response to the sodium ion by the intramolecular photoinduced electron transfer process [11] .…”

Calixarene-Based Molecules for Cation Recognition

“…The fluorescence emission of pyrene is quenched by an adjacent nitrophenol in 7, but the emission intensifies 8 times when Na + is complexed, which widens the distance between the carbonyl oxygens and separates both groups (log K ass for MSCN = 4.3 (Na), 2.9 (K), 2.2 (Cs), 1.9 (NH 4 ), 1.2 (Li), Et 2 O:MeCN 97:3) [37].…”

Tuning FRET efficiency as a novel approach for improved detection of naphthalene: application to environmental samples

“…Several photo sensing processes, viz. photo‐induced electron transfer (Kim and Quang, ; Aoki et al ., ; Ji et al ., ; Leray et al ., ; Leray et al ., ), intermolecular charge transfer (Xu et al ., ; Wang et al ., ), chelation‐enhanced fluorescence (CHEF) (Lim et al ., ; Guha et al ., ; Das et al ., ), excimer/exciplex formation (Weller, ) and fluorescence resonance energy transfer (FRET) (Förster, ; Förster, ; van der Meer et al . ), are available for selective determination of the analytes.…”