Highly Selective Colorimetric Signaling of Iron Cations Based on Fluoran Dye

다국어 초록 (Multilingual Abstract)

<P> A highly selective colorimetric chemosensor based on fluoran dye for iron cations, 2'-anilino-3'methyl-6'-dibuthylamino-N-(2'-(2''-hydroxybenzylideneamino)ethyl) iso-indolin-1-one-fluoran (5), was designed and synthesized. The chemical structures of all the intermediates and fluoran dye 5 were characterized by 1H-NMR, 13C-NMR, MS and elemental analysis. And its sensing behavior toward metal ions was investigated by UV-visible absorption spectroscopes. The fluoran dye 5 chemosensor showed an extreme selectivity for Fe2+ and Fe3+ in acetonitrile solution. Whereas other ions including Mg2+, Pd2+, Ni2+, Hg2+, Cd2+, Ag+, Cu2+, Zn2+ and Al3+ induced basically no spectral change, which constituted a Fe2+ highly sensitive and selective colorimetric chemosensor from colorless to black by “naked eyes.” Spectral responses at &lgr;max = 653 nm reveals that dye 5 can function as OR logic gate with Fe2+ and Fe3+ as input variables.</P>