A fluorescent conjugated polymer for trace detection of diamines and biogenic polyamines
作者:Biqing Bao、Lihui Yuwen、Xiannuo Zheng、Lixing Weng、Xingrong Zhu、Xiaowei Zhan、Lianhui Wang
DOI:10.1039/c0jm01467b
日期:——
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.
Water-soluble hyperbranched polyelectrolytes with high fluorescence quantum yield: Facile synthesis and selective chemosensor for Hg2+ and Cu2+ ions
作者:Biqing Bao、Lihui Yuwen、Xiaowei Zhan、Lianhui Wang
DOI:10.1002/pola.24128
日期:——
investigated. The obtained hyperbranchedpolyelectrolyte HPFA2 with lower content of branch unit (2%) showed excellent solubility and highfluorescencequantumyield (ϕF = 89%) in aqueous solution. Fluorescence quenching of HPFA2 by different metal ions was also investigated, the polyelectrolyte showed highselectivity for Hg2+ and Cu2+ ions relative to other various metal ions in buffer solution. The