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- W2896091059 abstract "The photoresponsive viologen unit has been widely used to endow metal–organic materials with photochromic and other photomodulable properties. Herein we report the first examples of the metal–organic materials functionalized by extended viologens (ExVs), of general formula [ML]·2H2O (M = Zn for 1, M = Mn for 2, M = Co for 3, and L is a tetracarboxylate ligand with the p-phenylene-extended viologen spacer). Of the three isomorphic metal–organic frameworks, only 1 is photochromic owing to formation of extended viologen radicals through photoinduced electron transfer (PET). The incapability of 2 and 3 to undergo photochromism can be ascribed to longer intermolecular donor–acceptor contacts, emphasizing the sensitivity of solid-state PET to structural changes. 1 also shows strong fluorescence owing to interligand charge transfer, and the fluorescence can be reversibly modulated and switched on/off in the photochromic process. Furthermore, 1 shows excellent hydrolytic stability and can be used as a sensitive, selective, and recyclable fluorescence sensor for detecting Fe3+ in water. The results demonstrated the great potential of extended viologens as functional units for the design of novel responsive metal–organic materials." @default.
- W2896091059 created "2018-10-26" @default.
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- W2896091059 date "2018-10-09" @default.
- W2896091059 modified "2023-10-11" @default.
- W2896091059 title "Metal–Organic Frameworks with Extended Viologen Units: Metal-Dependent Photochromism, Photomodulable Fluorescence, and Sensing Properties" @default.
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- W2896091059 doi "https://doi.org/10.1021/acs.cgd.8b01383" @default.
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