LAUSR

Abstract A new fluorescent-colorimetric probe 1-[(9H-fluoren-2-ylimino)methyl]-2-naphthalenol (FIMN) was designed and synthesized. FIMN is a multi-ion probe which can detect not only Al3+ ions by the change of fluorescent intensity, but also Fe3+, Co2+, and Cu2+ ions by color changes. The detection limits of FIMN with Al3+, Fe3+, Co2+ and Cu2+ ions were 2.643 × 10−8, 1.843 × 10−6, 8.349 × 10−5 and 5.035 × 10−5 M. The bonding ratios and association constant (Ka) of FIMN with Al3+, Fe3+, Co2+ and Cu2+ ions were studied by Job’s plot and concentration titration experiments. 1H NMR titration experiments were conducted to discuss the coordination modes of FIMN. And the detection mechanism can be explained by C N isomerization.