A tetrahedral zinc(II) coordination polymer: Synthesis, characterisation, and application in ascorbic Acid fluorescence sensing

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2024-11-03 DOI:10.1016/j.molstruc.2024.140530

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Abstract

A new coordination polymer (CP), {[Zn(HL)₂(bib)]ₙ.0·25H₂O} (1), was synthesized and characterized for its structural, thermal, and luminescence properties. The compound was obtained by reacting H₃L= 3-(4-carboxyphenoxy)-5-methylbenzoic acid, bib = 1,4-bis(1-imidazoly)benzene, and Zn(ClO₄)₂·6H₂O in aqueous solution, followed by hydrothermal treatment at 120 °C for 72 h. Single-crystal X-ray diffraction revealed a 1D polymeric chain with zinc centres in a distorted tetrahedral geometry, coordinated by carboxylate and imidazole-based ligands. Infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) confirmed the bonding environment and thermal stability. CP 1 exhibited strong luminescence, peaking at 205 nm upon excitation at 285 nm, and demonstrated selective sensing of ascorbic acid (AA) with a high quenching efficiency (K_sv = 4.35 × 10² M⁻¹) and a detection limit of 3.15 × 10^⁻4 M The luminescence was pH-dependent, with optimal fluorescence near neutral pH. These findings highlight the potential of CP 1 as a sensitive probe for AA detection, offering applications in environmental monitoring and chemical sensing.

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四面体锌（II）配位聚合物：合成、表征及在抗坏血酸荧光传感中的应用

合成了一种新型配位聚合物（CP）{[Zn(HL)₂(bib)]ₙ.0-25H2O} (1)，并对其结构、热和发光特性进行了表征。该化合物是由 H3L= 3-(4-羧基苯氧基)-5-甲基苯甲酸、bib=1,4-双(1-咪唑基)苯和 Zn(ClO₄)₂-6H₂O 在水溶液中反应，然后在 120 °C 下水热处理 72 小时而得到的。单晶 X 射线衍射显示出一条一维聚合物链，锌中心呈扭曲的四面体几何形状，由羧酸盐和咪唑配体配位。红外光谱（FT-IR）和热重分析（TGA）证实了其成键环境和热稳定性。CP 1 发出强烈的荧光，在 285 纳米波长激发下，荧光在 205 纳米波长处达到峰值，并显示出对抗坏血酸（AA）的选择性传感，具有很高的淬灭效率（Ksv = 4.35 × 10² M-¹），检测限为 3.15 × 10-4 M。这些发现凸显了 CP 1 作为 AA 检测灵敏探针的潜力，可应用于环境监测和化学传感。

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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.