A multifunctional fluorescent chemosensor for Al³⁺ and Cu²⁺ has been developed, which displays a dual-model and on–off fluorescence response upon addition of Al³⁺ and Cu²⁺ respectively. The fluorescence signals of the chemosensor can be restored with F⁻ and ethylenediaminetetraacetic acid (EDTA) disodium for Al³⁺ and Cu²⁺, showing that the binding of the chemosensor and Al³⁺/Cu²⁺ is chemically reversible. The ‘in situ’ prepared Al³⁺ complex (1·Al) showed high selectivity toward F⁻, which can be applied to distinguish F⁻ from Cl⁻, Br⁻ and I⁻. Moreover, the fluorescence emission intensity of the ‘in situ’ prepared Cu²⁺ complex (1·Cu) is increased with the addition of Al³⁺, demonstrating that 1·Cu could be a good off–on Al³⁺ sensor candidate.

中文翻译：

---

一种双模型和开闭荧光的Al ³⁺ /铜²⁺ -chemosensor和F的检测^- /铝³⁺与“就地制备”的Al ³⁺ /铜²⁺络合物†

用于铝的多功能荧光化学传感器³⁺和Cu ²⁺已经被开发出来，其中显示了双模型和开闭时添加Al的荧光响应³⁺和Cu ²⁺分别。该化学传感器的荧光信号可以被F恢复^-和乙二胺四乙酸（EDTA）二钠中的Al ³⁺和Cu ²⁺，表明化学传感器与Al ³⁺ / Cu ^2+的结合是化学可逆的。在“原位”制备的Al ³⁺配合物（1·铝）表现出较高的选择性朝向˚F ^- ，其可以适用于区分˚F ^-选自Cl ^- ，溴^-和我^- 。此外，“原位”制备的Cu ²⁺络合物（1·Cu）的荧光发射强度随着Al ³⁺的添加而增加，表明1·Cu可能是很好的Al ³⁺传感器候选人。