A Discotic Mesogenic near-infrared absorbing dye and its application in photo-responsive liquid crystal elastomers

IF 5.4 1区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

GIANT Pub Date : 2024-04-26 DOI:10.1016/j.giant.2024.100271

Shimin Shao , Miao Bao , Ruohan Chen , Zhenghao Zhang , Haifeng Lu , Meng Wang , Hong Yang

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Abstract

Near-infrared (NIR) light-responsive liquid crystal elastomers (LCEs) doped with organic small-molecule photothermal agents have garnered scientific attention. However, the challenge remains in designing and synthesizing mesogenic photothermal dyes with absorption wavelengths greater than 800 nm. In this research, we design a novel discotic mesogenic NIR absorbing dye, namely the nickel bis(dithiolene) complex YHD868, and prepare NIR-responsive LCE/YHD868 composite films. The discotic mesogenic molecule YHD868 possesses a columnar hexagonal mesophase and exhibits intense NIR absorption at 868 nm, with a photothermal conversion efficiency of about 27 % and a molar extinction coefficient of approximately 30000 M⁻¹·cm⁻¹. Due to the strong NIR absorption of YHD868, combined with its excellent photothermal stability, the LCE/YHD868 composite films exhibit remarkable photoresponse and mechanical properties. Even at a low doping concentration of 0.2 wt%, the composite film can achieve a tensile strength of 9.8 MPa and an elongation at break of 165 %. Under 880 nm NIR irradiation (3.3 W·cm⁻²), the film can complete reversible photo-induced shrinking deformation in just 2 s, with a shrinkage ratio of about 64 %. This work offers a new approach for the development of photo-responsive smart soft materials.

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一种 Discotic Mesogenic 近红外吸收染料及其在光响应液晶弹性体中的应用

掺杂有机小分子光热剂的近红外（NIR）光响应液晶弹性体（LCE）已引起科学界的关注。然而，设计和合成吸收波长大于 800 纳米的介导型光热染料仍是一项挑战。在这项研究中，我们设计了一种新型盘状介原近红外吸收染料，即双二硫代二亚硝基镍络合物 YHD868，并制备了近红外响应型 LCE/YHD868 复合薄膜。盘状介原分子 YHD868 具有柱状六方介相，在 868 纳米波长处表现出强烈的近红外吸收，光热转换效率约为 27%，摩尔消光系数约为 30000 M-1-cm-1。由于 YHD868 具有很强的近红外吸收能力，再加上其出色的光热稳定性，LCE/YHD868 复合薄膜表现出卓越的光响应和机械性能。即使在 0.2 wt% 的低掺杂浓度下，复合薄膜也能达到 9.8 MPa 的拉伸强度和 165 % 的断裂伸长率。在 880 纳米近红外辐照（3.3 W-cm-2）下，薄膜可在短短 2 秒内完成可逆的光诱导收缩变形，收缩率约为 64%。这项研究为开发光响应智能软材料提供了一种新方法。

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来源期刊

GIANT Multiple-

CiteScore

8.50

自引率

8.60%

发文量

审稿时长

42 days

期刊介绍： Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.