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A new aza-15-crown-5 derivative  1  bearing coumarin and hydrazone moieties was synthesized and characterized. The fluorescent sensing behavior and selectivity of  1  toward different metal ions in ethanol were investigated. There are 4-fold and 2-fold fluorescence enhancements of  1  at λ em =406 nm upon addition of five equivalents of K +  and Ba 2+ , respectively. The fluorescence titration revealed the stoichiometry of 1:1 for  1 -K +  1 -Ba 2+  complexes and the binding constants (lg K  s ) of 4.11 for  1 -K +  and 3.61 for  1 -Ba 2+ . Compound  1  can be used as a fluorescent chemosensor for K +  and Ba 2+  through discriminable photoresponse signals. The calculated detection limits for K +  and Ba 2+  are 2.28 μ m  and 5.21 μ m , respectively.

Fluorescence chemosensor containing 4-methyl-7-coumarinyloxy, acetylhydrazono and N -phenylaza-15-crown-5 moieties for K + and Ba 2+ ions