Donor–acceptor based two-dimensional covalent organic frameworks for near-infrared photothermal conversion†

IF 6 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Materials Chemistry Frontiers Pub Date : 2021-06-24 DOI:10.1039/D1QM00462J
Yue Zhang, Guiyuan Wu, Hui Liu, Rui Tian, Yan Li, Danbo Wang, Renzeng Chen, Jinyu Zhao, Shipeng Liu, Zhibo Li and Yingjie Zhao
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引用次数: 3

Abstract

Two 2D COFs containing both naphthalene diimides (NDIs) as an electron acceptor (A) and triphenylamine (PT-N-COF) or triphenylbenzene (PT-B-COF) as electron donors (D) were prepared successfully. The in-plane donor and acceptor units were connected through imine bonds with precise spatial distribution. The charge-transfer (CT) process induced from the D–A interactions in the 2D plane results in distinct near-infrared absorption properties. The unique structure modification in the skeleton of the COFs led to a great difference in photophysical properties and photothermal conversion properties. Compared to PT-B-COF, PT-N-COF containing triphenylamine as a donor displayed much stronger D–A interactions and CT effects, and thus exhibited obvious red-shift absorption in the NIR region. The photothermal conversion efficiency reached 66.4% in sharp contrast to 31.2% for PT-B-COF. EPR spectra verified the presence of unpaired electrons, which is consistent with the CT interaction in the ground state. The DFT molecular orbital simulation further revealed the mechanism of the photophysical properties and the CT process.

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基于供体-受体的二维共价有机框架用于近红外光热转换†
成功制备了以萘二亚胺(ndi)为电子受体(A),以三苯胺(PT-N-COF)或三苯基苯(PT-B-COF)为电子给体(D)的二维COFs。平面内供体和受体通过亚胺键连接,空间分布精确。二维平面上由D-A相互作用引起的电荷转移(CT)过程导致了明显的近红外吸收特性。COFs骨架上独特的结构修饰导致其光物理性能和光热转换性能有很大差异。与PT-B-COF相比,以三苯胺为供体的PT-N-COF表现出更强的D-A相互作用和CT效应,因此在近红外区表现出明显的红移吸收。光热转换效率达到66.4%,与PT-B-COF的31.2%形成鲜明对比。EPR谱证实了未配对电子的存在,这与基态的CT相互作用一致。DFT分子轨道模拟进一步揭示了光物理性质的机理和CT过程。
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来源期刊
Materials Chemistry Frontiers
Materials Chemistry Frontiers Materials Science-Materials Chemistry
CiteScore
12.00
自引率
2.90%
发文量
313
期刊介绍: Materials Chemistry Frontiers focuses on the synthesis and chemistry of exciting new materials, and the development of improved fabrication techniques. Characterisation and fundamental studies that are of broad appeal are also welcome. This is the ideal home for studies of a significant nature that further the development of organic, inorganic, composite and nano-materials.
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Back cover Back cover New heater@luminescent thermometer nano-objects: Prussian blue core@silica shell loaded with a β-diketonate Tb3+/Eu3+ complex† Multiscale engineering of anode catalyst layers in proton exchange membrane water electrolyzers Back cover
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