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Photoresponsive Rotaxane-Branched Dendrimers: From Nanoscale Dimension Modulation to Macroscopic Soft Actuators
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-06-16 , DOI: 10.1021/jacs.3c04103 Wei-Jian Li 1 , Wei-Tao Xu 1 , Xu-Qing Wang 1 , Yefei Jiang 1 , Yu Zhu 1 , Dan-Yang Zhang 1 , Xiao-Qin Xu 1 , Lian-Rui Hu 1 , Wei Wang 1 , Hai-Bo Yang 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-06-16 , DOI: 10.1021/jacs.3c04103 Wei-Jian Li 1 , Wei-Tao Xu 1 , Xu-Qing Wang 1 , Yefei Jiang 1 , Yu Zhu 1 , Dan-Yang Zhang 1 , Xiao-Qin Xu 1 , Lian-Rui Hu 1 , Wei Wang 1 , Hai-Bo Yang 1
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Aiming at the construction of novel soft actuators through the amplified motions of molecular machines at the nanoscale, the design and synthesis of a new family of photoresponsive rotaxane-branched dendrimers through an efficient controllable divergent approach was successfully realized for the first time. In the third-generation rotaxane-branched dendrimers, up to 21 azobenzene-based rotaxane units located at each branch, thus making them the first successful synthesis of light-control integrated artificial molecular machines. Notably, upon alternative irradiation with UV and visible light, photoisomerization of the azobenzene stoppers leads to the collective and amplified motions of the precisely arranged rotaxane units, resulting in controllable and reversible dimension modulation of the integrating photoresponsive rotaxane-branched dendrimers in solution. Moreover, novel macroscopic soft actuators were further constructed based on these photoresponsive rotaxane-branched dendrimers, which revealed fast shape transformation behaviors with an actuating speed up to 21.2 ± 0.2° s–1 upon ultraviolet irradiation. More importantly, the resultant soft actuators could produce mechanical work upon light control that has been further successfully employed for weight-lifting and cargo transporting, thus laying the foundation toward the construction of novel smart materials that can perform programmed events.
中文翻译：
光响应轮烷支化树枝状聚合物：从纳米级尺寸调制到宏观软执行器
针对通过纳米尺度分子机器的放大运动构建新型软执行器，首次通过高效可控发散方法成功实现了新型光响应轮烷支化树枝状大分子的设计与合成。在第三代轮烷支化树枝状聚合物中，每个分支上有多达21个偶氮苯基轮烷单元，这使得它们成为第一个成功合成的光控集成人工分子机器。值得注意的是，在紫外光和可见光交替照射下，偶氮苯终止物的光异构化导致精确排列的轮烷单元的集体和放大运动，导致溶液中集成光响应轮烷支化树枝状聚合物的可控和可逆尺寸调节。此外，基于这些光响应轮烷支化树枝状聚合物进一步构建了新型宏观软致动器，其显示出快速形状转换行为，致动速度高达21.2±0.2°s紫外线照射时为–1 。更重要的是，由此产生的软执行器可以通过光控制产生机械功，并已进一步成功应用于举重和货物运输，从而为构建可以执行编程事件的新型智能材料奠定了基础。
更新日期：2023-06-16
中文翻译：
光响应轮烷支化树枝状聚合物：从纳米级尺寸调制到宏观软执行器
针对通过纳米尺度分子机器的放大运动构建新型软执行器，首次通过高效可控发散方法成功实现了新型光响应轮烷支化树枝状大分子的设计与合成。在第三代轮烷支化树枝状聚合物中，每个分支上有多达21个偶氮苯基轮烷单元，这使得它们成为第一个成功合成的光控集成人工分子机器。值得注意的是，在紫外光和可见光交替照射下，偶氮苯终止物的光异构化导致精确排列的轮烷单元的集体和放大运动，导致溶液中集成光响应轮烷支化树枝状聚合物的可控和可逆尺寸调节。此外，基于这些光响应轮烷支化树枝状聚合物进一步构建了新型宏观软致动器，其显示出快速形状转换行为，致动速度高达21.2±0.2°s紫外线照射时为–1 。更重要的是，由此产生的软执行器可以通过光控制产生机械功，并已进一步成功应用于举重和货物运输，从而为构建可以执行编程事件的新型智能材料奠定了基础。
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