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In this study, we designed and synthesized a simple probe 2-(8-((8-methoxyquinolin-2-yl)methoxy)quinolin-2-yl)benzo[ d ]thiazole (DQT) for detection of Ag + and Cd 2+ in a CH 3 OH/HEPES (9 : 1 v/v, pH = 7.30) buffer system. Its structure was characterized by NMR, ESI-HR-MS and DFT calculations, and its fluorescence performance was also investigated. Probe DQT showed fluorescence quenching in response to Ag + and Cd 2+ with low detection limits of 0.42 μM and 0.26 μM, respectively. Importantly, the complexation of the probe with Cd 2+ resulted in a red shift from blue to green, making it possible to detect Ag + and Cd 2+ by the naked eye under an ultraviolet lamp. The DQT-Cd 2+ complex could be used for sequential recognition of S 2- . The recovery response could be repeated 3 times by alternate addition of Cd 2+ and S 2- . A filter paper strip test further demonstrated the potential of probe DQT as a convenient and rapid assay., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

In this study, a highly selective chemosensor ML based on a BODIPY fluorescent chromophore was synthesized for sequential recognition of Cu 2+ and HSO 3 - in a CH 3 OH/H 2 O (99 : 1 v/v) system, which contained three recognition sites and its structure characterized by 1 H NMR, 13 C NMR and ESI-HR-MS. The sensor ML showed an obvious "on-off" fluorescence quenching response toward Cu 2+ and the ML-Cu 2+ complex showed an "off-on" fluorescence enhancement response toward HSO 3 - . The detection limit of the sensor ML was 0.36 μM to Cu 2+ and 1.4 μM to HSO 3 - . In addition, the sensor ML showed a 1 : 3 binding stoichiometry to Cu 2+ and the recovery rate of ML-Cu 2+ complex identifying HSO 3 - could be over 70%. Sensor ML showed remarkable detection ability in a pH range of 4-8., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

In this study, a highly sensitive and selective fluorescent chemosensor, ethyl( E )-2-((2-((2-(7-(diethylamino)-2-oxo-2 H -chromene-3-carbonyl)hydrazono)methyl)quinolin-8-yl)oxy)acetate (1), was synthesized and characterized by 1 H NMR, 13 C NMR and ESI-MS. Sensor 1 showed an "on-off" fluorescence response to Pb 2+ with a 1 : 1 binding stoichiometry in CH 3 CN/HEPES buffer medium (9 : 1 v/v). The detection limit of sensor 1 to Pb 2+ was determined to be 0.5 μM, and the stable pH range for Pb 2+ detection was from 4 to 8., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)