A lead selective dimeric quinoline based fluorescent chemosensor and its applications in milk and honey samples, smartphone and bio-imaging.

Dimeric quinoline-based Schiff base was developed (DQS) for the specific detection of Pb ion via fluorimetry. DQS coordinates with Pb, a variation in fluorescence intensity with enhanced radical blue shift was observed due to the restriction of CN rotation, CN isomerization, and photoinduced electron transfer (PET) mechanisms. In addition, the intramolecular charge transfer (ICT) from electron-donating morpholine to phenylene diamine acceptor linked quinoline bridge is responsible for the blue-shifted fluorescence enhancement in the DQS-Pb complex.

Quinoline based reversible fluorescent probe for Pb; applications in milk, bioimaging and INHIBIT molecular logic gate.

We report the modular design and synthesis of an amine dangled Schiff base quinoline-morpholine conjugate (QMC) for highly selective detection of Pb ions via fluorimetry. The sensing strategy of QMC towards Pb ion exhibits a large blue shift with fluorescent enhancement via the intramolecular charge transfer (ICT) process. At the same time, QMC coordination with Pb, the CN single bond rotation between quinoline and morpholine rings and the CN isomerization process were blocked.

Triphenyl-imidazole based reversible coloro/fluorimetric sensing and electrochemical removal of Cu ions using capacitive deionization and molecular logic gates.

A simple hydroxyl-substituted triphenyl-imidazole based receptor (HTPI) which selectively detects Cu ion by colorimetric and fluorimetric methods was developed. HTPI detects the Cu ions with the absorption enhancement and fluorescence quenching by the possible ligand to metal charge transfer (LMCT) and the chelation-enhanced quenching (CHEQ) approaches, respectively. HTPI showed high selectivity and sensitivity for Cu ions detection over other interfering and competing metal ions.