Abstract
Two new highly selective colorimetric and fluoregenic aminopyridine Schiff bases (L1 and L2) were synthesized by simple refluxing method and characterised via standard NMR and HRMS techniques. Its excellent metal sensing abilities explored on absorbance and fluorescence spectroscopy. The recognition colorimertric sensing behavior of probes L1 and L2 towards Ni(II), Zn(II), Fe(III) and UO2(II) ions were carefully investigated with different aspects of sensing behavior such as sensitivity, binding constant, stoichiometry, pH range and interference effect. Moreover, L1 and L2 also displayed excellent "off-on" fluoregenic selectivity with Zn(II). The results revealed that the sensors provided colorimetric and fluoregenic sensing excellent response with low limit of detection, under neutral conditions. (C) 2015 Elsevier B.V. All rights reserved.