A reversible photochromic covalent organic framework

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2024-10-01 DOI:10.1038/s41467-024-52788-3

Xue-Tian Li, Meng-Jing Li, Yuan-Liang Tian, Shu-Lin Han, Lei Cai, Hui-Chao Ma, Ying-Qiang Zhao, Gong-Jun Chen, Yu-Bin Dong

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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.

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可逆光致变色共价有机框架

共价有机框架是一种通过共价键连接的结晶多孔材料，在吸附、分离、催化等方面有许多潜在的应用。然而，很少有关于光致变色的相关报道。幸运的是，通过超声波方法可以快速生成肼键连接的 DBTB-DETH-COF。在光和空气的作用下，DBTB-DETH-COF 表现出从黄色到橄榄色的可逆光致变色（至少 50 个周期），随后在加热后又恢复到原来的颜色。此外，DBTB-DETH-COF 的结构在光照 15 天后仍保持不变。此外，还通过电子顺磁共振、X 射线光电子能谱、电化学表征和瞬态吸收测量等方法探讨了光致变色过程的原因。可逆光致变色 DBTB-DETH-COF 可在空气存在下用作防伪油墨和光学开关。这项工作拓展了一种稳定的有机光致变色材料，拓宽了 COF 的应用领域。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.