The development of water-soluble polymeric probes capable of recognizing more than one analyte is quite challenging and has attracted significant attention. A water-soluble random copolymer (P1) consisting of hydrophilic N,N′-dimethyl acrylamide (DMA) and aldehyde-terminated difluoroboron dipyrromethene (BODIPY) methacrylate segment was synthesized via the reversible addition–fragmentation chain transfer (RAFT) polymerization for the detection of Hg²⁺ and HSO₄⁻ ions, respectively. The aldehyde terminal end of P1 was post-functionalized with 4-amino phenol through a Schiff-base condensation reaction, leading to a final polymeric probe (P2). P2 exhibited both colorimetric and fluorimetric responses according to the pH of the aqueous solution or bubbling the solution with CO₂, manifesting itself as a pH indicator and CO₂ sensor. Upon the addition of Hg²⁺ ions, P2 showed apparent color changes from pink to light yellow under ambient light and colorless to bright green emission under 365 nm UV light with a very low limit of detection (LOD = 1.10 μM). At low pH, no change in the fluorescence enhancement was observed upon exposure to Hg²⁺ ions, whereas the fluorescence intensity of P2 increased remarkably at high pH. Similar sensing behavior was observed for HSO₄⁻ ions with a LOD of 1.12 μM. P2 was quite selective toward Hg²⁺ and HSO₄⁻ over the other metal cations and anions tested, respectively. The detection of both Hg²⁺ and HSO₄⁻ ions originated from the direct hydrolysis of imine bonds of P2.

中文翻译：

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BODIPY衍生的多通道的聚合物化学传感器具有pH可调灵敏度：选择性比色和Hg的荧光检测²⁺和HSO ₄ ^-在水介质†

能够识别一种以上分析物的水溶性聚合物探针的开发具有很大的挑战性，并引起了广泛的关注。通过可逆的加成-断裂链转移（RAFT）聚合反应合成了由亲水性N，N'-二甲基丙烯酰胺（DMA）和醛封端的二氟硼二甲基亚丙基（BODIPY ）组成的水溶性无规共聚物（P1）的汞²⁺和HSO ₄ ^-分别离子。P1的醛末端通过Schiff碱缩合反应用4-氨基苯酚进行后官能化处理，从而形成最终的聚合物探针（P2）。根据水溶液的pH或用CO ₂鼓泡溶液，P2表现出比色和荧光响应，表现为pH指示剂和CO ₂传感器。加入Hg ²⁺离子后，P2在环境光下显示出从粉红色到浅黄色的明显颜色变化，在365 nm紫外光下从无色到亮绿色的发射，检测限很低（LOD = 1.10μM）。在低pH下，暴露于Hg ²⁺离子后未观察到荧光增强的变化，而在高pH下P2的荧光强度显着增加。对于HSO ₄观察到类似的传感行为⁻ LOD为1.12μM的离子。P2是朝向汞柱相当选择性²⁺和HSO ₄ ^-比其他金属阳离子和阴离子测试，分别。既汞的检测²⁺和HSO ₄ ^-的离子源自的亚胺键的直接水解P2。