用于钾离子高选择性检测的铽配合物荧光传感器

Fluorescent Sensor Based on Terbium Complex for a Highly Selective Detection of Potassium Ion (K⁺)

摘要: 钾离子(K⁺)作为生命体内重要的金属离子，在维持细胞渗透压、神经传导和肌肉收缩等生理过程中发挥着关键作用。水环境中K⁺浓度的监测对环境保护和生物医学研究具有重要意义。本研究成功合成了一种新型三足结构配体4,4',4''-[N-三(2-羟乙基)氨基甲基]三苯甲酸(H₃L)，并以其为基础制备了稳定的稀土铽配合物TbL。实验结果表明，TbL能够作为高效的荧光传感器，对水环境中的K⁺实现快速、灵敏的检测，其检测限达到0.52 μM。该传感器还表现出优异的选择性、抗干扰性和可重复使用性。综上所述，TbL被认为是一种具有广阔应用前景的K⁺荧光化学传感器，为环境水样中钾离子的监测提供了新的解决方案。

Abstract: Potassium ions (K⁺), as important metal ions in living organisms, play a crucial role in regulating key physiological processes, including cellular osmotic pressure, nerve conduction, and muscle contraction. The monitoring of K⁺ concentration in aqueous environments is of great significance for environmental protection and biomedical research. In this study, a novel tripodal ligand, 4,4',4''-[N-tris(2-hydroxyethyl)aminomethyl] tribenzoic acid (H₃L), was successfully synthesized and subsequently used to construct a stable rare earth terbium complex (TbL). Experimental results demonstrate that TbL serves as an efficient fluorescent sensor for the rapid and sensitive detection of K⁺ in aqueous media, achieving a low detection limit of 0.52 μM. The sensor also exhibits excellent selectivity, strong anti-interference capability, and good reusability. In summary, TbL is a highly promising fluorescent chemosensor for K⁺ detection, offering a promising new approach for monitoring potassium ions in environmental water samples.