期刊
INORGANIC CHEMISTRY
卷 60, 期 1, 页码 108-114出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c02463
关键词
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资金
- National Natural Science Foundation of China [21901133, 21571111]
- Key research and development project of Shandong Province [2019GGX102006]
This study synthesized two new photochromic chain complexes through self-assembly, achieving reversible room-temperature fluorescence and phosphorescence switching by light irradiation and thermal treatment. The electron transfer photochromic behavior and generated stable radicals were found to play a key role in this process.
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 room-temperature 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.
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