A reversible photochromic covalent organic framework

Xue-Tian Li, Meng-Jing Li, Yuan-Liang Tian, Shu-Lin Han, Lei Cai, Hui-Chao Ma, Ying-Qiang Zhao, Gong-Jun Chen () and Yu-Bin Dong ()
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Xue-Tian Li: Shandong Normal University
Meng-Jing Li: Shandong Normal University
Yuan-Liang Tian: Shandong Normal University
Shu-Lin Han: Shandong Normal University
Lei Cai: Shandong Normal University
Hui-Chao Ma: Shandong Normal University
Ying-Qiang Zhao: Shandong Normal University
Gong-Jun Chen: Shandong Normal University
Yu-Bin Dong: Shandong Normal University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract 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.

Date: 2024
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DOI: 10.1038/s41467-024-52788-3

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