Abstract
A new Al3+ sensor, 6-ethoxychromone-3-carbaldehyde-(3-hydroxy-2-naphthalene acyl) hydrazone (L), was designed and synthesized. The sensor L could exist steadily and detect Al3+ in the pH range from 5.0 to 8.0 in ethanol and water (3:1, v/v). This sensor showed good selectivity and high sensitivity towards Al3+ in the presence of most metal ions, and a remarkable enhancement in fluorescence emission intensity at 508 nm (λex = 420 nm) was observed with addition of 1equiv Al3+, which was attributed to the inhibition of photoinduced electron-transfer (PET) phenomenon and CN isomerization process. With the fluorescence titration experiments and the ESI-MS spectrum data, we reached the conclusion that the binding ratio between L and Al3+ was 2:1. Besides, the binding constant (Ka) between L and Al3+ was calculated to be 9.24 × 103 M−1 and the detection limit of L for Al3+ was as low as 1.82 × 10−7 M.
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