A half-salamo-based fluorescent chemosensor HL based on 3,5-dichlorosalicylaldehyde was developed. Sensor HL showed a single selectivity for heavy metal Pb²⁺ ion by "on-turn" fluorescence in various common metal ions. After forming a 2 : 1 type complex with Pb²⁺ ion, the minimum detection limit (LOD) of HL for Pb²⁺ ion was calculated as 5.65 × 10⁻⁸ M. In addition, the complex formed by HL and Pb²⁺ ion was used as a new chemosensor L-Pb²⁺ for further recognition of cysteine (Cys), thereby releasing HL. The minimum detection limit (LOD) of Cys for L-Pb²⁺ was calculated as 3.80 × 10⁻⁷ M. The “on-off-on” mode of chemosensors HL and L-Pb²⁺ achieved by alternately adding Pb²⁺ and Cys has reached the recycling of chemosensors.

开发了基于3,5-二氯水杨醛的基于半萨拉莫的荧光化学传感器HL。传感器HL通过各种常见金属离子中的“开启”荧光显示出对重金属Pb ²⁺离子的单一选择性。与Pb ²⁺离子形成2：1型络合物后，HL对Pb ²⁺离子的最小检测限（LOD）计算为5.65×10 ^-8M。此外，由HL和Pb ²⁺形成的络合物离子被用作新的化学传感器L-Pb ²⁺以进一步识别半胱氨酸（Cys），从而释放HL。计算得出的L-Pb ²⁺的Cys最小检出限（LOD）为3.80×10 ^-7M。化学传感器HL和L-Pb ²⁺的“开-关-开”模式是通过交替添加Pb ^{2+而实现的}Cys已达到化学传感器的回收利用。