Structure and photochromic properties of two metal-viologen complexes derived from 1-amyl-4,4′-bipyridinium ligand

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2025-03-02 DOI:10.1016/j.molstruc.2025.141933

Haibing Han, Lin Li, Jinjian Liu

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Abstract

In this work, two metal-viologen complexes, formulated as [Zn₂(AQ)₂(BTEC)(H₂O)₈](H₂BTEC)·6H₂O (1) and {[Cu(AQ)(HBTEC)(H₂O)]·(H₄BTEC)_0.5}_n (2), have been designed and prepared in the reaction of the mono-substituted viologen ligand 1-amyl-4,4′-bipyridinium bromide (AQBr), 1,2,4,5-benzenetetracarboxylic acid (H₄BTEC) and different metal ions. Single-crystal structure analysis reveals that compound 1 has a discrete structure and compound 2 has a layered structure. In general, incorporating the viologen ligand into the framework will result in expected photochromic behavior. However, only compound 1 exhibits obvious photochromic behavior, compound 2 is non-photochromic. In addition, compound 1 also exhibits photo-modulated luminescence properties in the solid state and can be deposited on the filter paper, showing potential applications as an inkless printing material.

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由1-戊基-4,4′-联吡啶配体衍生的两种金属紫素配合物的结构和光致变色性质

本文设计并制备了两种金属紫素配合物，分子式为[Zn2(AQ)2(BTEC)(H2O)8]（H2BTEC）·6H2O(1)和{[Cu(AQ)(HBTEC)(H2O)]·（H4BTEC）0.5}n(2)，由单取代紫素配体1-氨基-4,4′-溴化联吡啶（AQBr）、1,2,4,5-苯四羧酸（H4BTEC）与不同的金属离子反应而成。单晶结构分析表明，化合物1具有离散结构，化合物2具有层状结构。一般来说，将紫素配体纳入框架将导致预期的光致变色行为。然而，只有化合物1表现出明显的光致变色行为，化合物2不表现出光致变色行为。此外，化合物1在固态下也表现出光调制发光特性，并且可以沉积在滤纸上，显示出作为无墨水印刷材料的潜在应用。

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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.