An "off-on" Zn(2+) and "on-off" Cu(2+) fluorescent chemosensor C was designed and synthesized. The binding of C and Zn(2+)/Cu(2+) is chemically reversible by the addition of EDTA disodium solution; moreover, the fluorescence emission signal of ZnC decreased with the addition of Cu(2+), demonstrating that ZnC could detect Cu(2+)via metal displacement.

中文翻译：

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用于Zn2 + / Cu2 +的高灵敏度和选择性荧光传感器，以及通过中心金属位移感测Cu2 +的新方法。

设计并合成了“开-关” Zn（2+）和“开-关” Cu（2+）荧光化学传感器C。通过添加EDTA二钠溶液，可化学逆转C和Zn（2 +）/ Cu（2+）的结合；此外，ZnC的荧光发射信号随着Cu（2+）的添加而降低，表明ZnC可以通过金属置换检测Cu（2+）。