A zinc coordination polymer fluorescence sensor for detecting Cu2+in water
As a heavy metal,copper ion(Cu2+)plays a key role in human bodies,but excessive Cu2+can induce various diseases and endanger human health.Therefore,it is important to develop new fluorescent sensors to detect Cu2+rapidly and sensitively.One-dimensional chain zinc coordination polymer(Zn-CP)was successfully prepared by hydrothermal method using 1,4-bis(3,5-dicarboxy phenoxy)benzene(H4L)as the primary ligand and 1,10-phenanthroline(phen)as the secondary ligand,which can be used as a fluorescence sensor for the efficient detection of Cu2+in water.The Zn-CP possessed excellent fluorescent properties and can selectively and sensitively detect Cu2+in aqueous solutions through luminescence quenching.In the range of 0-0.8×10-6mol/L,the Cu2+concentration showed a good linear relationship with the fluorescence attenuation of the sensor and the detection limit was 1.22×10-8 mol/L,which was lower than the limit set by the US Environmental Protection Agency(2.05×10-5mol/L).In addition,the quenching mechanism of Zn-CP in Cu2+detection may be attributed to the formation of new chemical bonds between the coordination polymers and the Cu2+.This work provided a new strategy for the construction of coordination polymer-based fluorescence sensors with water-stable systems.
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