A 2,6-diformyl-p-cresol (DFC)-4-amino antipyrine (AP) based dual signaling fluorescent Schiff base ligand (DFCAP) is found to exhibit colorimetric and fluorescence turn on selective sensing towards metal ions, Zn²⁺ and Al³⁺. It also exhibits a significant aggregation induced emission (AIE) phenomenon by controlling the water–THF solvent ratio which provides robust green emissive fluorogenic aggregates with well-defined morphologies. Turn-on fluorescence enhancements as high as 195 fold and 168 fold in methanol for Al³⁺ and Zn²⁺ at 480 nm and 508 nm, respectively, were noticed. The binding constants and stoichiometry determined from the fluorescence titration data are K = 7.63 × 10⁴ M⁻¹ and 3.42 × 10⁴ M⁻¹ and 1 : 1 complexation for both Al³⁺ and Zn²⁺ respectively, supported by Job's method. DFCAP shows high sensitivity towards the detection of Zn²⁺ and Al³⁺ ions with very low detection limit values of ca. ∼21 nM and 30 nM respectively. Besides by applying its attractive AIE feature, the green emissive hydrosol functions as a good chemosensor with high sensitivity for a selected explosive TNP through ground state complexation with a LOD value of ca. ∼1.74 μM and especially a high Stern–Volmer quenching constant of ca. ∼4.14 × 10⁵ M⁻¹. For instant ‘naked eye’ response for the trace detection of TNP in the solution state, we fabricated a simple paper strip that could detect TNP on-site in a fast, inexpensive and simple way.

中文翻译：

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基于安替比林的荧光“开启”双传感器，用于Zn ²⁺和Al ³⁺，其选择性荧光“关闭”感测到处于聚集状态的2,4,6-三硝基苯酚（TNP）†

甲2,6- diformyl- p甲酚（DFC）-4-氨基基于双信令荧光希夫碱配体（DFCAP）安替比林（AP）被发现表现出对金属离子，锌在选择性感测比色和荧光转²⁺和Al ³⁺。通过控制水与四氢呋喃的溶剂比率，它还表现出显着的聚集诱导发射（AIE）现象，从而提供了具有明确定义形态的坚固的绿色发光荧光聚集体。对于Al ³⁺和Zn ²⁺，分别在480 nm和508 nm处的甲醇中开启荧光增强分别高达195倍和168倍。由荧光滴定数据确定的结合常数和化学计量比为K = 7.63×10由Job方法支持的分别对Al ³⁺和Zn ^2+的4 M ^-1和3.42×10 ⁴ M ^-1和1：1的络合。DFCAP对Zn ²⁺和Al ³⁺离子的检测具有很高的灵敏度，而ca的检测极限值却非常低。分别约为21 nM和30 nM。除了利用其引人注目的AIE功能外，绿色发射的水溶胶还可以通过基态络合，LOD值为ca，对选定的爆炸性TNP具有高灵敏度，对选定的爆炸性TNP具有高灵敏度。约为1.74μM，尤其是大约为Stern-Volmer的高淬灭常数。约4.14×10 ⁵M ^-1。为了对溶液状态中的TNP进行痕量检测具有即时的“裸眼”响应，我们制作了一个简单的纸条，可以以快速，廉价和简单的方式在现场检测TNP。