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An intensely fluorescent zinc-salicylideneimine complex (1-Zn(ii)) was developed as a fluorescent ratiometric detector for the quantitative determination of trace water contents both in THF and methanol. It works based on a water-triggered cascade process: the dissociation reaction of the supramolecular ensemble and the subsequent hydrolysis reaction of its ligand. [ABSTRACT FROM AUTHOR]

An “off-the-shelf” fluorescence “turn-on” Mg2+ chemosensor 3,5-dichlorosalicylaldehyde (BCSA) was rationally designed and developed. This proposed sensor works based on Mg2+-induced formation of the 2 : 1 BCSA–Mg2+ complex. The coordination of BCSA to Mg2+ increases its structural rigidity generating a chelation-enhanced fluorescence (CHEF) effect which was confirmed by single crystal XRD studies of the BCSA–Mg2+ complex and TD/DFT calculations. This sensor exhibits high sensitivity and selectivity for the quantitative monitoring of Mg2+ with a wide detection range (0–40 μM), a low detection limit (2.89 × 10−7 mol L−1) and a short response time (＜0.5 s). It can also resist the interference from the other co-existing metal ions, especially Ca2+. Consequently, this fluorescent sensor can be utilized to monitor Mg2+ in real time within actual samples from drinking water. [ABSTRACT FROM AUTHOR]