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Reversible Optical Writing and Data Storage in an Anthracene‐Loaded Metal‐Organic Framework
摘要： Metal-organic frameworks (MOFs) enable the design of host-guest systems with specific properties. In this work, we show how confinement of anthracene in a well-chosen MOF host leads to reversible yellow-to-purple photoswitching of fluorescence emission. This behavior has not been observed before for anthracene, either in pure form or adsorbed in other porous hosts. The photoresponse of the host-guest system is caused by the photodimerization of anthracene, which is greatly facilitated by the pore geometry, connectivity and volume as well as the structural flexibility of the MOF host. The photoswitching behavior is used to fabricate photopatternable and erasable surfaces that, in combination with data encryption and decryption, hold promise in product authentication and secure communication applications.
关键词： product authentication,photoswitching,anthracene,metal-organic frameworks,host-guest system
更新于2025-09-04 15:30:14
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Reversible Optical Writing and Data Storage in an Anthracene-Loaded Metal-Organic Framework
摘要： Metal-organic frameworks (MOFs) enable the design of host-guest systems with specific properties. In this work, we show how confinement of anthracene in a well-chosen MOF host leads to reversible yellow-to-purple photoswitching of fluorescence emission. This behavior has not been observed before for anthracene, either in pure form or adsorbed in other porous hosts. The photoresponse of the host-guest system is caused by the photodimerization of anthracene, which is greatly facilitated by the pore geometry, connectivity and volume as well as the structural flexibility of the MOF host. The photoswitching behavior is used to fabricate photopatternable and erasable surfaces that, in combination with data encryption and decryption, hold promise in product authentication and secure communication applications.
关键词： product authentication,photoswitching,anthracene,metal-organic frameworks,host-guest system
更新于2025-09-04 15:30:14
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A photoresponsive molecularly imprinted polymer with rapid visible-light-induced photoswitching for 4-ethylphenol in red wine
摘要： The trans to cis isomerization of the azobenzene chromophore in most azobenzene-based photoresponsive molecularly imprinted polymers (MIPs) is initiated by UV irradiation. This limits the application of these materials in cases where UV light toxicity is an issue, such as in biological systems, food monitoring, and drug delivery. Herein we report a tetra-ortho-methyl substituted azobenzene, (4-[(4-methacryloyloxy)-2,6-dimethyl phenylazo]-3,5-dimethyl benzenesulfonic acid (MADPADSA). The photoswitching of MADPADSA could be induced by visible-light in 4-hydroxyethylpiperazineethanesulfonic acid (HEPES) buffer-ethanol (4:1, v/v) at pH 7.0, however, the photo-isomerization was slow. With the use of MADPADSA as a functional monomer, NaYF4:Yb3+,Er3+ as a substrate, 4-ethylphenol (4-EP) as a template, a novel photoresponsive surface molecularly imprinted polymer NaYF4:Yb3+,Er3+@MIP was obtained. The NaYF4:Yb3+,Er3+@MIP displayed rapid visible-light-induced photoswitching. The NaYF4:Yb3+,Er3+ substrate could efficiently increase the trans to cis isomerization rate of the photoresponsive MIP on its surface, which was faster than that of the corresponding azobenzene monomer MADPADSA. Possible reasons for this effect were investigated by fluorescence spectroscopy. NaYF4:Yb3+,Er3+@MIP displayed good specificity toward 4-EP with a specific binding constant (Kd) of 3.67 × 10?6 mol L?1 and an apparent maximum adsorption capacity (Qmax) of 10.73 μmol g?1, respectively. NaYF4:Yb3+,Er3+@MIP was applied to determine the concentration of 4-EP in red wine with good efficiency and a limit of detection lower than the value that could cause an unpleasant off-flavor.
关键词： Molecularly imprinted polymer,Visible-light-induced photoswitching,4-Ethylphenol,Red wine,Azobenzene
更新于2025-09-04 15:30:14
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Fabrication of Metal–Organic Framework Thin Films Using Programmed Layer‐by‐Layer Assembly Techniques
摘要： Metal–organic frameworks (MOFs) are a rather new class of crystalline, nanoporous solids that are self-assembled from inorganic, metal or metal-oxo nodes and organic linkers. Powder MOFs are originally developed for gas storage and catalyst applications, but more recently, more advanced applications have used well-defined MOF thin films in electronic, photonic, and sensing devices. MOF thin films for targeted applications can be fabricated on appropriately functionalized substrates using a programmed layer-by-layer (LbL) assembly technique, which yields oriented, highly crystalline MOF thin films (surface-mounted MOFs, SURMOFs). The LbL assembly technique as well as the huge potential of SURMOFs is presented herein. Emerging SURMOF properties related to their heteroepitaxy, postsynthetic modification/crosslinking, lithography, and photoswitching are highlighted.
关键词： lithography,photoswitching,MOF thin film,layer-by-layer assembly,heteroepitaxy
更新于2025-09-04 15:30:14