A Highly Selective Fluorescent Chemosensor for K⁺ from a Bis-15-Crown-5 Derivative

Fluorescence quenching of versatile fluorescent probes based on strongly electron-donating distyrylbenzenes responsive to aromatic chlorinated and nitro compounds, boronic acid and Ca2+

“…12. The linear relationship shows that the fluorescence quenching constants are closely rationalized to the electron-accepting ability of the quenchers and strongly suggests the PET process is concerned to fluorescence quenching observed in the present system [36]. …”

Metal Chelation Chemistry

“…The turn-on fluorescence response of 109 toward motions of the ethylene bond in the sandwiched structure [107][108][109]. Dimerization of 15-crown-5-functionalized π -conjugated molecules by templation with K + is also exploited for an efficient signal transduction mechanism of conjugated polymer (CP) sensors [110].…”

Synthesis and fluorescent sensory properties of a 5-cyanostilbene derivative linked to monoaza-15-crown-5

“…For larger metal ions which cannot be accommodated by the crown ether due to its limited cavity size, the affinity between them is significantly reduced. In this case, there is a tendency for the metal ions being sandwiched between adjacent crown ether units (Licchelli et al, 2006;Xia et al, 1999).…”