The novel coumarin fluorescent probes, which have two fluorescent groups, were synthesized through the reaction of coumarin derivatives (7-hydroxy-4-trifluorocoumarin) and piperazine. It was found that the compound which has less space groups, showed high selectivity of Cu^2＋, and other metal ions did not interfere with its recognition for Cu^2＋. When the concentration of Cu^2＋ was in the range of 2.0×10^－6～1.0×10^－4 mol/L, there was a good linearity between the fluorescence intensity of the probe and the concentration of Cu^2＋.

Key words: 7-hydroxy-4-trifluorocoumarin, piperazine, fluorescent probe, Cu^2＋, property