A multifunctional fluorescent probe for detecting metal cations based on a novel zinc coordination polymer

IF 4.6 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2025-10-01 DOI:10.1016/j.saa.2025.127004

Wei Zhao , Ai Wang , Sisi Feng , Caixia Yuan , Ulli Englert

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引用次数: 0

Abstract

A novel zinc-based coordination polymer, namely [Zn(HDPNA)(2,2′-bipy)]_n (1, H₃DPNA = 2-(3,5-dicarboxylphenyl)nicotinic acid, 2,2′-bipy = 2,2′-bipyridine), was successfully constructed through a mixed-ligand strategy. Fluorescence analysis revealed that 1 displayed selective fluorescence enhancement exclusively towards Ag⁺ ions, with a detection limit of 9.73 × 10⁻⁹ M, which may be due to π···Ag⁺···π interactions formed between Ag⁺ ions and the suitably arranged ligands in the polymer. Molecular docking results confirmed that such interactions enhance electron delocalization and inhibit non-radiative transitions. In addition, 1 exhibited highly selective luminescence quenching responses towards Cu²⁺ and Co²⁺ ions, with detection limits of 8.75 × 10⁻⁹ M and 4.36 × 10⁻⁹ M, respectively. The addition of excessive glutathione enabled 1 to display different ‘on’ and ‘off’ behaviors towards Cu²⁺ and Co²⁺ and thus allowed to assess even mixtures of these cations. With respect to the detection mechanism of 1 towards Cu²⁺ and Co²⁺, we suggest based on theoretical calculations that photoinduced electron transfer (PET) may lead to fluorescence quenching. Detection experiments under realistic conditions have proved that this new fluorescence sensor can be applied to the detection of Ag⁺, Cu²⁺ and Co²⁺ in real life samples, e.g. tap water. Coordination polymer 1 represents an efficient and multifunctional chemical sensor platform based on ‘on-off’ fluorescence detection and may provide guidance for the advanced development of multi-ions sensors based on coordination compounds.

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一种基于新型锌配位聚合物的多功能金属阳离子荧光探针。

通过混合配体策略成功构建了一种新型锌基配位聚合物[Zn(HDPNA)(2,2'-bipy)]n （1,h3dpna = 2-（3,5-二羧基苯基）烟酸，2,2'-bipy = 2,2'-联吡啶）。荧光分析表明，1对Ag+离子表现出选择性荧光增强，检测限为9.73 × 10-9 M，这可能是由于Ag+离子与聚合物中合适排列的配体形成π··Ag+··π相互作用所致。分子对接结果证实，这种相互作用增强了电子离域，抑制了非辐射跃迁。此外，1对Cu2+和Co2+离子表现出高度选择性的发光猝灭响应，检出限分别为8.75 × 10-9 M和4.36 × 10-9 M。过量谷胱甘肽的加入使我对Cu2+和Co2+表现出不同的“开”和“关”行为，从而可以评估这些阳离子的混合物。关于1对Cu2+和Co2+的探测机制，我们根据理论计算提出光致电子转移（PET）可能导致荧光猝灭。现实条件下的检测实验证明，这种新型荧光传感器可以应用于自来水等实际样品中Ag+、Cu2+和Co2+的检测。配位聚合物1代表了一种基于“开-关”荧光检测的高效多功能化学传感器平台，可为基于配位化合物的多离子传感器的深入开发提供指导。

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.