Abstract
A series of naphthaldehyde-2-pyridinehydrazone derivatives were discovered to display interesting 'turn-on' fluorescence response to Zn2+ in 99% water/DMSO (v/v) at pH7.0. Mechanism study indicated that different substituent groups in the naphthaldehyde moiety exhibited significant influence on the detection of Zn2+ . The electron rich group resulted in longer fluorescence wavelengths but smaller fluorescence enhancement for Zn2+ . Among these compounds, 1 showed the highest fluorescence enhancement of 19-fold with the lowest detection limit of 0.17μmol/L toward Zn2+ . The corresponding linear range was at least from 0.6 to 6.0μmol/L. Significantly, 1 showed an excellent selectivity toward Zn2+ over other metal ions including Cd2+ .
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