Photochromic metal-organic frameworks based on diarylethene: Synthesis, crystal structure and application in coating

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2025-02-08 DOI:10.1016/j.molstruc.2025.141715

Le Zhao , Xiangcong Meng , Jincheng Du , Tingting Fan , Guanming Liao , Feng Luo , Gang Liu , Congbin Fan , Shouzhi Pu

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Abstract

A new photochromic diarylethene metal-organic framework material (DMOF), [Cd₂(BCM) (4,4′-bipyridine)] (Cd(II)-DMOF), has been synthesized by combining 4,4′-bipyridine and diarylethene H₂BCM (H₂BCM = 1,2-bis [5-carboxyl-2-methyl-3-thienyl]-3,3,4,4,5,5-hexafluorocyclo1-ene) with Cd(II). The Cd(II)-DMOF is a 6-coordinate orthorhombic crystal system with prism lengths of 9.919 Å (a), 23.809 Å (b) and 11.740 Å (c), and belongs to the Pnna space group. Cd(II)-DMOF exhibits significant color change between colorless and blue when alternately irradiated with Vis and UV light, due to the reversible transformation of its open-ring and closed-ring form of structure. The compact structure of Cd(II)-DMOF enables it to seal N₂ in the closed-ring state. However, in the case of the open-ring state of Cd(II)-DMOF with a larger aperture, the N₂ is easy to desorb. Doping coating with Cd(II)-DMOF can modify the color by UV and visible light in a very short time, which will extend the possible range of applications.

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基于二乙烯的光致变色金属有机骨架：合成、晶体结构及其在涂料中的应用

以4,4′-联吡啶和二乙烯基H2BCM （H2BCM = 1,2-双[5-羧基-2-甲基-3-噻吩基]-3,3,4,4,5,5-六氟环1烯）与Cd（II）结合，合成了一种新型光致变色二乙烯基金属有机骨架材料（DMOF） [Cd2(BCM)（4,4′-联吡啶）]（Cd(II)-DMOF）。Cd(II)-DMOF是一个六坐标正交晶系，棱镜长度分别为9.919 Å (a)、23.809 Å (b)和11.740 Å (c)，属于Pnna空间群。Cd(II)-DMOF在可见光和紫外光交替照射下，由于其开环和闭环结构形式的可逆转变，呈现出明显的无色和蓝色之间的颜色变化。Cd(II)-DMOF的致密结构使其能够将N2封闭在闭合环状态。而Cd(II)-DMOF在孔径较大的开环状态下，N2容易解吸。用Cd(II)-DMOF掺杂涂层可以在很短的时间内通过紫外和可见光对颜色进行修饰，这将扩大可能的应用范围。

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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.