Water-soluble and highly selective fluorescent sensor from naphthol aldehyde-tris derivate for aluminium ion detection

• A novel water-soluble fluorescent chemosensor based on naphthalene derivate was designed.
• The fluorescent chemosensor for Al3+ could be synthesized simply.
• The fluorescent sensor exhibited high selectivity for Al3+ in absolute water media (pH = 7.0).

In the paper, a highly selective aluminum ion fluorescent probe based on naphthalene derivate has been synthesized and characterized systemically. The probe molecule for aluminum ion exhibits excellent water solubility, and it shows strong blue fluorescence under ultraviolet light, which is attributed to the Photoinduced Electron Transfer (PET) process. In addition, the large association constant between probe and aluminum ion is 1.19 × 108 M−1, which is obtained by fluorescent measurement. Moreover, the binding site of L with Al3+ is determined by 1HNMR titration experiment.

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