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A novel AIE active dual-channel chemosensor G1 based on coumarin derivatives was constructed, which shows high sensitivity and selectivity detection of Fe3+ (in water solution, LOD = 4.88 × 10−7 M) in DMSO/H 2 O (1:9, v/v, pH = 7.2) binary solutions and had strong anti-interference toward Hg2+, Ag+, Ca2+, Cu2+, Co2+, Ni2+, Cd2+, Pb2+, Zn2+, Cr3+and Mg2+. Notably, the actual usage of sensor G1 was further demonstrated by NAND logic gates and test kits. • AIE based sensor G1. • G1 shows colorimetric and "turn-on" fluorescence detection of Fe3+ with high sensitivity and selectivity. • G1 responds with Fe3+ in DMSO/H 2 O, 1:9, pH = 7.2. • Test strips and NAND logic gates based on G1 was prepared and constructed. A novel AIE active dual-channel coumarin derivatives, chemosensor G1 , was synthesised and used for detecting Fe3+ (in water solution) in DMSO/H 2 O (1:9, v/v, pH = 7.2) binary solutions, which induced the colour of solution of G1 from yellow to shallow orange and increased the fluorescence emission, indicating that G1 could act as a corking colorimetric and "turn-on" fluorescence probe for detecting Fe3+. What's more, sensor G1 has good anti-interference toward Ca2+, Hg2+, Cu2+, Ag+, Cd2+, Co2+, Ni2+, Mg2+, Pb2+, Zn2+ and Cr3+. Notably, the actual usage of sensor G1 was further demonstrated by logic gates and test kits. [ABSTRACT FROM AUTHOR]

A new high-selectivity and high-sensitivity copper (II) sensor F2 based on benzimidazole derivatives was designed and synthesized. • The synthesis process of F2 is simple and environmentally friendly. • F2 shows "naked-eye" and fluorescence "turn-off" response for Cu2+. • The mechanism of action of F2 on Cu2+ may be ligand-metal charge transfer (LMCT). • A test strips of F2 was prepared to detect Cu2+ quickly and easily. • F2 has been used for ultra-sensitive IMPLICATION logic gates. Reversible dual channel sensor F2 for detection Cu2+ is designed and synthesized. F2 is substantially unaffected by other cationic ions during the recognition of Cu2+. It is worth noting that the low detection limit of sensor F2 is 9.09 × 10−9, and the detection limit is lower that to the reported sensor for identifying Cu2+. Through various experiments and characterization, it is proved that ligand-metal charge transfer (LMCT) is the interaction mechanism between F2 and Cu2+. It is further certified that the stoichiometry between F2 and Cu2+ is 1:1. In addition, the fluorescence changes of F2 upon the addition of Cu2+ and EDTA are applied as an ultrasensitive IMPLICATION logic gate at the molecular level. At the same time, molecular keyboard experiments have achieved information protection at the molecular level. More importantly, the test strips containing F2 can be easily and quickly tested to achieve on-site inspection. [ABSTRACT FROM AUTHOR]