Four new fluorophores containing multiple fluorogenic branches of phenylene-ethynylene and salicylic acid Cu2+ binding sites are synthesized and evaluated as Cu2+ sensors in aqueous media. The fluorophore, F4, having a triphenylamine core and three fluorogenic branches, possesses superior sensitivity, selectivity and emission properties for fluorescence quenching detection of Cu2+. This fluorophore exhibits the highest Cu2+ quenching sensitivity in aqueous solution; Ksv = 5.79 × 106 M−1. The relatively high fluorescence emission of this fluorophore provides excellent visual contrast in a solid state paper-based sensor that enables naked eye detection of Cu2+ at the picomole level.
本研究合成了四种新的荧光团,它们含有
苯乙炔和
水杨酸 Cu2+ 结合位点的多个致
氟分支,并将其作为
水介质中的 Cu2+ 传感器进行了评估。荧光团 F4 具有一个
三苯胺核心和三个含
氟分支,在荧光淬灭检测 Cu2+ 方面具有优异的灵敏度、选择性和发射特性。这种荧光团在
水溶液中对 Cu2+ 的淬灭灵敏度最高;Ksv = 5.79 × 106 M-1。这种荧光团的荧光发射率相对较高,为固态纸基传感器提供了极佳的视觉对比度,可实现皮摩尔级的 Cu2+ 肉眼检测。