A novel Schiff base fluorescence probe(S)for Al3+is designed and synthesized from 2-hydroxy-1-naphthaldehyde and o-aminobenzaldehyde,and characterized by means of 1HNMR spectrum,13 CNMR spectrum,ESI-MS and IR spectrum.The results from spectral analysis show that probe S exhibits good selectivity and naked eye identification to Al3+in a DMSO-H2O(V/V=4∶1)solution.The concentration of Al3+in the range of 2.0-50 μmol·L-1 shows a linear relationship with the fluorescent intensity,while the detection limit is 0.033 μmol L-1.A complex is formed between the probe S and Al3+in a 1∶1 ratio.The interaction between probe S-Al3+complex and DNA is investigated through fluorescence spectroscopies.Experimental results show that the complex quenches DNA dynamically.In addition,the binding constant,binding-site numbers and thermodynamic parameters of the interaction between probe S-Al3+complex and DNA are calculated at different temperature.It is indicated that the interacting forces belongs to hydrophobic action,showing an intercalation interaction mode.
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