Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China.
Dalton Trans. 2020 Jun 14;49(22):7488-7495. doi: 10.1039/d0dt00397b. Epub 2020 May 22.
A two-dimensional Cd(ii) metal-organic framework (MOF) was constructed from a tris(pyridinium)-based hexacarboxylate zwitterionic ligand. The MOF shows a novel fashion of 2-fold 2D → 2D parallel entanglement. It is the entanglement that dictates close interlayer contacts between carboxylate (electron donor) and pyridinium (acceptor), which in turn impart the MOF with reversible photochromic properties through photoinduced electron transfer (PET). This is an extension of PET-based photochromism from bipyridinium to multipyridinium compounds. Thanks to the photoresponsive behaviour, the fluorescence of the MOF can be reversibly modulated or switched by photoirradiation. Besides, the fluorescence of the water-stable MOF in aqueous dispersion is very sensitive to nitrofuran antibiotics with high selectivity, and therefore the MOF is a good candidate of efficient and regenerable sensing material for determination of the antibiotics in water media.
一种二维 Cd(ii) 金属-有机骨架（MOF）由一种基于三（吡啶鎓）的六羧酸酯两性离子配体构建而成。该 MOF 呈现出一种新颖的 2 倍 2D→2D 平行缠结方式。正是这种缠结导致了羧酸盐（电子给体）和吡啶鎓（受体）之间的紧密层间接触，这反过来又通过光诱导电子转移（PET）赋予 MOF 可逆光致变色性能。这是从联吡啶到多吡啶化合物的基于 PET 的光致变色的扩展。由于光响应行为，MOF 的荧光可以通过光照射来可逆地调制或切换。此外，水稳定的 MOF 在水分散体中的荧光对硝基呋喃类抗生素非常敏感，具有高选择性，因此 MOF 是一种用于测定水介质中抗生素的高效且可再生传感材料的良好候选物。
