The photogeneration of stable radicals is important but still challenging in the field of optical switching, displays and other devices. Herein, the crystalline 9-anthracene carboxylic acid (9-AC) and a mononuclear...
Stimulating tunable room-temperature phosphorescence (RTP) is still a challenge in photochromic systems, which is vital for multifunctional coordination materials. Herein, we synthesized two new photochromic chain complexes through self-assembly of the nonphotochromic 1,3,5-tris(4-pyridyl)benzene ligand, diphosphonate, and Ln(III) ions (1 for Ln(III) = Dy and 2 for Ln(III) = Gd). Both compounds showed fast photoresponses with the color turning from yellow to dark gray with a reversible decoloration by heating or storage in the dark. The electron transfer photochromic behavior with the generated stable radicals was further confirmed by the room-temperature UV−vis and electron paramagnetic resonance spectra. Furthermore, via tuning the generation and disappearance of stable radicals, reversible roomtemperature fluorescence and phosphorescence for both compounds were switched by light irradiation and a thermal treatment, with an enhanced intensity for RTP and a decrease in fluorescence during the duration of Xe-lamp light irradiation. This work provides a new strategy that photogenerated radicals could promote and enhance RTP properties in functional materials.
A Dy(III)-based linear chain compound was reported with eye-detectable and reversible photochromic phenomenon under ambient condition. After light irradiation, room temperature luminescence response and photodemagnetization effect were for the first...
Photomagnetic materials have attracted enormous attention due to the adjustable coloration and magnetization via light irradiation, while challenges still exist for drastically tuning the magnetism at room temperature. Herein, a novel multifunctional crystal complex (H2− = oxalate and TPB = 1,3,5-tris(4-pyridyl)benzene) is constructed by selfassembly of paramagnetic Fe 3+ ions, electron donor oxalate, and electron acceptor TPB ligands. After light irradiation, the compound 1 undergoes unidirectional electron transfer (ET) from oxalate to TPB ligands and Fe 3+ ions, which not only results in the decomposition of oxalate and generation of radicals and Fe 2+ species but also leads to remarkable ET-triggered photochromism. Importantly, room temperature light irradiation changes the magnetic behavior of 1 from weak to strong antiferromagnetism. Moreover, thanks to the stability of the photogenerated radicals, the photoresponsive proton conductivity property for 1 is also explored and photoenhanced proton conductivity is observed after photoirradiation.
Electrical bistability existing in biochemical networks is critical for the proper functionalization of living systems. The development of artificial materials with electrical bistability begun to attract much interest due to...
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