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A solution of the spirooxazine (1.0 x 10-4 M) was freshly prepared in 1,4-dioxane with the subsequent addition of one equivalent solution of each relevant cation such as Na+, K+, Mg2+, Ca2+, Sr2+, Ba2...+, Sn2+, Pb2+, Mn2+,Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Cr3+ and Fe3+ (1.0 x 10-4 M). The metal-ligand complexes were mainly investigated by UV-Vis spectroscopy. In the case of ferric ions, spirooxazine provides the new absorption response at 654 nm, indicating the complex formation of Fe3+ with spirooxazine in the open form. Meanwhile, other metal ions did not strongly bind to spirooxazine, giving rise to no absorption peak at 654 nm observed. The stoichiometry of complex was investigated via Job’s method as the 1:1 ratio of spirooxazine with Fe3+. The detection limit of ferric ions is 2.61 𝜇M. Moreover, the spirooxazine-based molecular sensor was further developed for determination of spiked ferric ions in drinking water.show more
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