The aggregation-based trace detection of diamines and biogenic polyamines has been developed utilizing a carboxylic acid-functionalized polyfluorene (PFCOOH-BT5) containing benzo[2,1,3]thiadiazole (BT). Upon addition of diamines or biogenic polyamines, the PFCOOH-BT5 can be cross-linked via electrostatic interactions between the polymer carboxylic acid binding sites and the amino groups of the multiamines to form interpolymer aggregation, which leads to more efficient FRET from fluorene segments to BT units and thus a noticeable fluorescence color change from blue to orange. In contrast, addition of 1,3-propanediol does not lead to significant variations in the photoluminescence spectra of PFCOOH-BT5. This unique fluorescence response from PFCOOH-BT5 to diamines and biogenic polyamines can achieve a detection concentration as low as 2 μM, indicating that PFCOOH-BT5 can serve as a general and effective chemosensor to detect trace diamines and biogenic polyamines.
利用含有苯并[2,1,3]
噻二唑 (BT) 的
羧酸功能化聚
芴 (PFCOOH-BT5) 开发了基于聚集的二胺和
生物多胺痕量检测。添加二胺或
生物多胺后,PFCOOH-BT5 可以通过聚合物
羧酸结合位点与
多胺氨基之间的静电相互作用进行交联,形成互聚物聚集体,从而实现从
芴段到 BT 的更有效的 FRET单位,因此明显的荧光颜色从蓝色变为橙色。相反,添加
1,3-丙二醇不会导致 PFCOOH-BT5 的光致发光光谱发生显着变化。 PFCOOH-BT5对二胺和
生物多胺的这种独特的荧光响应可以实现低至2 μM的检测浓度,表明PFCOOH-BT5可以作为检测痕量二胺和
生物多胺的通用且有效的
化学传感器。