A new carbazole-based probe 1 was synthesized by condensation of 3-formyl-9-ethylcarbazole and 2-picolinyl hydrazide . Probe 1 exhibits selective fluorescence recognition to Cu 2+in CH3CN-H2O(9/1,v/v,HEPES 0.02 mol· dm-3,pH=7.0)solution with a noticeable fluorescence intensity enhancement .Except Co2+behaves slight interference ,other metal ions such as Ni 2+,Hg2+, Ba2+,Mg2+,Ag+,K+,Ce3+,Mn2+,Pb2+,Na+,Sr2+,Zn2+,Cd2+,Cr3+and Fe3+do not induce such fluorescence changes and have no significant influence on Cu 2+recognition process .% 由3-甲酰基-9-乙基咔唑和吡啶2-甲酰肼缩合制备了一种基于咔唑的结构简单的探针分子1。探针1在CH3 CN-H2 O（9/1，v/v，HEPES 0．02 mol· dm-3，pH＝7．0）溶液中对Cu2＋具有良好的选择性，且表现为荧光增强。除了Co2＋具有轻微干扰外，其他金属离子如 Ni2＋，Hg2＋，Ba2＋，Mg2＋，Ag＋，K＋，Ce3＋，Mn2＋，Pb2＋，Na＋，Sr2＋，Zn2＋， Cd2＋，Cr3＋和Fe3＋对Cu2＋的识别无显著干扰。
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