Structural distinction and highly sensitive fluorescent detection properties of Cd-based multifunctional sensors with three flexible isomers

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2024-06-27 DOI:10.1016/j.molstruc.2024.139162

Xue Yang, Yixia Ren, Wanting Liu, Zhixiang Wang, Meili Zhang, Jijiang Wang

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Abstract

Many environmental pollutants are found and need to be detected and treated with the rapid development of industry. Three novel Cd (II) coordination polymers (Cd-CPs) (1–3), with the formula of [Cd(2-HDBB)(4,4′-bbpy)](1), [Cd(3-HDBB)(4,4′-bbpy)](2) and [Cd(4-HDBB)(4,4′-bbpy)_0.5·2H₂O](3) based on three soft organic isomers: n-(3,5-dicarboxylato benzyloxy) benzoic acid (n = 2, 3 or 4-H₃DBB), with one linear N-donor ligand 4,4′-bis(imidazolyl) biphenyl (4,4′-bbpy) have been synthesized hydrothermally and characterized in detail. The significant structural differences are both coordination polymers 1 and 2 featuring two-dimensional networks, while 3 with 1D ladder-like chain due to the change of isomers. Despite structural differences, the series of Cd-CPs exhibits similar fluorescence sensing properties. Fluorescent sensing properties exhibit all the Cd-CPs have been discovered to detect Fe³⁺, Cr₂O₇²⁻, tetracycline (TET) and nitrobenzene (NB) selectively and sensitively with the low detection limits, respectively. The results of theoretical calculation verified the fluorescence detection mechanism of NB by these cadmium complexes. Therefore, the Cd-CPs might be used as an excellent multi-functional luminescent sensor in the future.

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具有三种灵活异构体的镉基多功能传感器的结构区别和高灵敏荧光检测特性

随着工业的快速发展，许多环境污染物亟待检测和处理。三种新型镉（II）配位聚合物（Cd-CPs）（1-3）分别为[Cd(2-HDBB)(4,4′-bbpy)](1)、[Cd(3-HDBB)(4,4′-bbpy)](2)和[Cd(4-HDBB)(4,4′-bbpy)0.5-2H2O](3)，它们基于三种软有机异构体：正(3,5-二羧基苄氧基)苯甲酸（n = 2、3 或 4-H3DBB）和一种线性 N-供体配体 4,4′-双(咪唑基)联苯（4,4′-bbpy）。结构上的显著差异是配位聚合物 1 和 2 都具有二维网络，而 3 则由于异构体的变化而具有一维梯形链。尽管结构不同，但这一系列镉-氯化石蜡具有相似的荧光传感特性。研究发现，所有镉氯化石蜡的荧光传感特性都能分别选择性地、灵敏地检测到 Fe3+、Cr2O72-、四环素（TET）和硝基苯（NB），而且检测限很低。理论计算的结果验证了这些镉配合物对 NB 的荧光检测机制。因此，Cd-CPs 未来可用作一种出色的多功能发光传感器。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.