一种可逆光致变色共价有机框架。

A reversible photochromic covalent organic framework.

作者信息

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

机构信息

College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan, 250014, P. R. China.

Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan, 250014, P. R. China.

出版信息

Nat Commun. 2024 Oct 1;15(1):8484. doi: 10.1038/s41467-024-52788-3.

DOI:10.1038/s41467-024-52788-3

PMID:39353931

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11448497/

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.

摘要

共价有机框架是一类通过共价键连接的晶态多孔材料，在吸附、分离、催化等方面有众多潜在应用。然而，关于光致变色的相关报道很少。幸运的是，通过超声法快速生成了一种腙连接的DBTB-DETH-COF。发现DBTB-DETH-COF在光照和空气存在下呈现从黄色到橄榄色的可逆光致变色（至少50个循环），随后加热时又变回原始颜色。此外，光照15天后DBTB-DETH-COF的结构保持不变。进一步通过电子顺磁共振、X射线光电子能谱、电化学表征和瞬态吸收测量对光致变色过程的原因进行了探讨。这种可逆光致变色的DBTB-DETH-COF在空气存在下可作为防伪墨水和光开关。这项工作拓展了一种稳定的有机光致变色材料，并拓宽了共价有机框架的应用范围。