Detection of metal ions in aqueous solutions is a major issue for environmental protection. Conjugated polyelectrolytes showing high sensitivity and selectivity towards the detection of metal ions are highly desirable. We report a water-soluble polyfluorene containing carboxylated groups (P1), poly[9,9′-bis(3′′-propanoate)fluoren-2,7-yl] sodium salt, which shows high recognition capability toward Cu+ and Cu2+. P1 was prepared via the hydrolysis of poly[9,9′-bis(tert-butyl-3′′-propanoate)fluoren-2,7-yl] (P0) which was synthesized by Suzuki coupling polymerization. The photoluminescence (PL) spectra of P1 in aqueous solution are significantly quenched in the presence of Cu+ and Cu2+. P1 shows high selectivity and sensitivity toward Cu+ and Cu2+, with the Stern–Volmer constants (Ksv) being 3.5 × 106 and 5.78 × 106 M−1, respectively. Moreover, the stoichiometric ratio of the P1 repeat unit to Cu+ or Cu2+ is 2 : 1 obtained from Job's plot. P1 maintains high selectivity towards Cu+ or Cu2+ in the presence of various metal cations. Our results demonstrate that P1 shows very high sensitivity and selectivity in recognizing Cu+ and Cu2+, indicating that it is a promising functional material for chemical sensors.
检测
水溶液中的
金属离子是环境保护的一个重要问题。对
金属离子检测具有高灵敏度和高选择性的共轭聚电解质非常受欢迎。我们报告了一种含有羧基的
水溶性聚
芴(P1)--聚[9,9′-双(3′′-
丙酸)
芴-2,7-基]钠盐,它对 Cu+ 和 Cu2+ 具有很高的识别能力。P1 是通过
水解聚[9,9′-双(叔丁基-3′′-
丙酸)
芴-2,7-基](P0)制备的,P0 是通过铃木偶联聚合反应合成的。P1 在
水溶液中的光致发光(PL)光谱在 Cu+ 和 Cu2+ 的存在下被明显淬灭。P1 对 Cu+ 和 Cu2+ 具有很高的选择性和敏感性,其 Stern-Volmer 常数(Ksv)分别为 3.5 × 106 和 5.78 × 106 M-1。此外,P1 重复单元与 Cu+ 或 Cu2+ 的
化学计量比为 2 :1。在各种
金属阳离子存在的情况下,P1 对 Cu+ 或 Cu2+ 保持较高的选择性。我们的研究结果表明,P1 在识别 Cu+ 和 Cu2+ 时具有极高的灵敏度和选择性,这表明它是一种很有前途的
化学传感器功能材料。