A new class of chemosensors (L1-L3) based on sequential coupling of 2,3-diaminomaleonitrile, 4-formyl-1-substituted phenyl-pyrazole-3-carboxylate and 2-hydroxy-1-naphthaldehyde through imine linkages were successfully designed and synthesized. The synthesized chemosensors showed quick colorimetric response with excellent selectivity and sensitivity towards detection of Mn²⁺ and Zn²⁺ ions in preference of other cations. Along with this, chemosensors also serve as fluorescent turn ‘off’ and turn ‘on’ switch for detection of Mn²⁺ and Zn²⁺ ion respectively. Analytical characterization were evaluated using UV–vis titration, fluorescent titration and Job’s plot methods which revealed that sensor interact with Mn²⁺ and Zn²⁺ ion in 1:1 and 1:2 binding stoichiometry respectively.

基于亚胺键，成功地设计了基于2,3-二氨基马腈，4-甲酰基-1-取代的苯基-吡唑-3-羧酸酯和2-羟基-1-萘醛的顺序偶联的新型化学传感器（L1-L3），并合成的。合成的化学传感器显示出快速的比色响应，对锰²⁺和锌²⁺离子的检测具有极好的选择性和灵敏度，优于其他阳离子。除此之外，化学传感器还用作荧光灯的“关闭”和“开启”开关，分别用于检测Mn ²⁺和Zn ²⁺离子。使用UV-vis滴定法，荧光滴定法和Job's plot方法评估了分析表征，结果表明传感器与Mn ²⁺相互作用和Zn ²⁺离子分别以1：1和1：2的化学计量比结合。