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An ortho-hydroxy-arylimine based probe: Fluorescence sensitivity towards Zn2+ ion†

Authors : Sunanda Deya, Pallab Gayenb and Chittaranjan Sinha*a



A probe 6,6-((1Z,1Z)-(((propane-1,3-diylbis(oxy))bis(2,1-phenylene))bis(azanylylidene))bis-(methanylylidene))bis(2-ethoxyphenol) (H2L), is synthesized by the condensation of 2,2-(propane-1,2-diylbis(oxy))dianiline with 3-ethoxy-2-hydroxybenzaldehyde and characterized by various spectroscopic techniques (1H NMR, FT-IR, ESI-MS etc.), exhibits greenish yellow emission (em 556 nm) upon binding with Zn2+ ion in H2O-CH3CN (1:9 v/v, HEPES buffer, pH 7.4) in a mixture of seventeen other biologically important metal ions. The limit of detection (LOD) is 15.5 nM. The 1:1 composition of the complex, Zn2+: L2–, is supported by Job’s plot, ESI-MS and 1H NMR measurements.



Zn2+ emission, turn-ON sensor, LOD 15.5 nM, fluorescent technique, 1:1 complexation