A reversible photochromic covalent organic framework

Covalent organic frameworks are a type of crystalline porous materials that linked through covalent bond, and they have numerous potential applications in adsorption, separation, catalysis, and more. However, there are rarely relevant reported on photochromism. Fortunately, a hydrazone-linked DBTB-D...

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Bibliographic Details
Published in:Nature communications 2024-10, Vol.15 (1), p.8484-9, Article 8484
Main Authors: Li, Xue-Tian, Li, Meng-Jing, Tian, Yuan-Liang, Han, Shu-Lin, Cai, Lei, Ma, Hui-Chao, Zhao, Ying-Qiang, Chen, Gong-Jun, Dong, Yu-Bin
Format: Article
Language:English
Subjects:
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639/301/923/1028
639/638/298/923/1028
639/638/298/923/3931
Catalysis
Counterfeiting
Covalence
Covalent bonds
Electrochemistry
Electron paramagnetic resonance
Electron spin resonance
Humanities and Social Sciences
Hydrazones
Inks
Light
multidisciplinary
Optical properties
Optical switching
Photochromism
Photoelectron spectroscopy
Photoelectrons
Porous materials
Science
Science (multidisciplinary)
Ultrasonic methods
X ray photoelectron spectroscopy
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Summary:Covalent organic frameworks are a type of crystalline porous materials that linked through covalent bond, and they have numerous potential applications in adsorption, separation, catalysis, and more. However, there are rarely relevant reported on photochromism. Fortunately, a hydrazone-linked DBTB-DETH-COF is rapidly generated through ultrasound method. The DBTB-DETH-COF is found to exhibit reversible photochromism (at least 50 cycles) from yellow to olive in the presence of light and air, and subsequently back to the original color upon heating. In addition, the structure of DBTB-DETH-COF remains unchanged after 15 days of light illumination. Furthermore, the reason of photochromic process is discussed by electron paramagnetic resonance, X-ray photoelectron spectroscopy, electrochemistry characterizations and transient absorption measurements. The reversible photochromic DBTB-DETH-COF can be used as anti-counterfeiting ink and optical switch in the presence of air. This work expands a stable organic photochromic material and broadens the applications of COFs. Reversible photochromic materials offer interesting applications and covalent organic frameworks which photochromic properties are rarely reported. Here, the authors prepare hydrazone-linked covalent organic frameworks with reversible photochromism as anti-counterfeiting inks and optical switches.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-52788-3