Inkless and erasable printing as a new technology has received intense attention in reducing paper waste and environmental hazards caused by the use of large amounts of ink. However, achieving highresolution printing by inkless and erasable printing for practical applications remains a huge challenge. Herein, a new metal−organic framework (MOF) has been synthesized, which exhibits a reversible photochromic behavior. None of the unpaired electrons of metal ions and a unique threedimensional network hinder electron transfer between the ligands and metal nodes, as well as between the ligands themselves, which are conducive to prolonging the photo-generated color lifetime and suitable for inkless and erasable printing. By virtue of the proper photo-generated color lifetime, strong contrast color before and after light irradiation, and reversible color transformation, a high-resolution printing content for inkless and erasable printing can be achieved by light irradiation. Notably, the paper coated with this MOF can be used for printing not only simple patterns such as pictures but also even texts for practical applications, surpassing other photochromic MOF materials for inkless and erasable printing, and almost comparable to ink and laser printing in terms of practicality and resolution. In addition, the MOF-coated paper can be reused for multiple cycles without significant deterioration.
Organic dye pollution has become an urgent issue due to their toxicity to humans and potential for damage to the environment. However, achieving highly efficient adsorption and degradation materials for...
Indoor detection of volatile organic compounds (VOCs) concentration is necessary due to the serious toxicity hazards even at trace level. However, physisorbents usually exhibit weak interactions especially in the presence of trace concentrations of VOCs, thus exhibiting poor responsive signal. Herein, we report a new flexible metal–organic framework (MOF) that exhibits interesting pore‐opening behavior after immersing in H2O. The pore‐opening phase shows significant (≈116 folds) and extremely fast (<1 minute) fluorescence enhancement after being exposed to saturated benzene vapor. The limit of detection concentration for benzene vapor can be calculated as 0.133 mg L−1. Thus this material represents the first MOF to achieve visual detection of trace benzene vapor by the naked eyes. Theoretical calculations and single‐crystal structure reveal that the special “bilateral π–π stacking” interactions between the host and guest, which facilitate electron transfer and greatly enhance the intensity of fluorescence.
Indoor detection of volatile organic compound (VOC, such as benzene and toluene vapors) concentration is necessary due to the serious toxicity hazards even at trace level. However, physisorbents usually exhibit weak interactions between sorbate and sorbent, thus exhibiting poor responsive signal especially in the presence of trace concentrations of VOCs. Herein, we report a new flexible metal-organic framework [Sr2(BINDI)(DMF)(H2O)]∙G (H4BINDI = N,N′-bis(5-isophthalic acid)naphthalenediimide, DMF = N,N-dimethylformamide, G = 0.6DMF) that exhibits interesting pore-opening behavior after immersing in H2O, hence allowing aromatic hydrocarbon molecules to diffuse into the pores. Interestingly, the pore-opening phase [Sr2(BINDI)(H2O)2] shows significant (∼116 fold) and extremely fast (< 1 minute) fluorescence "turn-on" behavior after exposed to saturated benzene vapor. The limit of detection concentration for benzene vapor can be calculated as 77 ppb. Thus this material represents the first MOF as fluorescent sensor achieving visual detection of trace benzene vapor by naked eyes. Theoretical calculations and single-crystal structure of [Sr2(BINDI)(H2O)2]⊃benzene reveal that the special "bilateral π-π stacking" interactions between electron-rich aromatic hydrocarbon and electron-deficient NDI cores facilitate electron transfer, and greatly enhance the intensity of fluorescence. Furthermore, this material can be fabricated into simple test strips, which enable visual detection of trace benzene vapor (3 ppm) under UV light.
Indoor detection of volatile organic compounds (VOCs) concentration is necessary due to the serious toxicity hazards even at trace level. However, physisorbents usually exhibit weak interactions especially in the presence of trace concentrations of VOCs, thus exhibiting poor responsive signal. Herein, we report a new flexible metal-organic framework (MOF) that exhibits interesting pore-opening behavior after immersing in H 2 O. The pore-opening phase shows significant ( � 116 folds) and extremely fast (< 1 minute) fluorescence enhancement after being exposed to saturated benzene vapor. The limit of detection concentration for benzene vapor can be calculated as 0.133 mg L À 1 . Thus this material represents the first MOF to achieve visual detection of trace benzene vapor by the naked eyes. Theoretical calculations and singlecrystal structure reveal that the special "bilateral π-π stacking" interactions between the host and guest, which facilitate electron transfer and greatly enhance the intensity of fluorescence.
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