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A coumarin-based Schiff base (receptor 1) exhibited fluorescence enhancement selectively with Zn(2+) at a nanomolar level in near-aqueous medium (EtOH-H2O; 1:1, v/v). The response was instantaneous with a detection limit of 3.26 × 10(-9) M. The sensing event is supposed to incorporate a combinational effect of intramolecular charge transfer (ICT), chelation-enhanced fluorescence (CHEF) and C[double bond, length as m-dash]N isomerization mechanisms. Various spectroscopic methods, viz. IR, UV-visible, fluorescence and NMR in association with single crystal XRD studies, were used for thorough investigation of the structure of receptor 1 as well as of the sensing event. The Zn(2+) complex of receptor 1 exhibited a very nice 1D chain coordination polymeric framework in its single crystal XRD.

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A simple Schiff base (RC) has been explored as a smart example of fluorescent material for the selective detection, differentiation and bioimaging of methanol. The nucleophilic attack of methanol on the cyclic control unit of RC leads to its opening and formation of a highly fluorescent moiety, RO. The RC displays a good sensitivity for MeOH with a detection limit of 0.042 wt% in water.