Seeing Is Believing:Directly Imaging Contractions of Artificial Molecular Muscles with Platinum Atom Markers  

作　　者：Dan-Yang Zhang Yonghui Zheng Yefei Jiang Wei-Jian Li Xu-Qing Wang Lianrui Hu Wei Wang Hai-Bo Yang 

机构地区：[1]Shanghai Key Laboratory of Green Chemistry and Chemical Processes,State Key Laboratory of Petroleum Molecular&Process Engineering,School of Chemistry and Molecular Engineering,East China Normal University,Shanghai 200062 [2]Key Laboratory of Polar Materials and Devices(MOE),Department of Electronics,East China Normal University,Shanghai 200241 [3]Shanghai Center of Brain-Inspired Intelligent Materials and Devices,East China Normal University,Shanghai 200241

出　　处：《CCS Chemistry》2024年第9期2162-2174,共13页中国化学会会刊（英文）

基　　金：financial support by the National Natural Science Foundation of China(grant no.92056203);the Science and Technology Commission of Shanghai Municipality(grant no.21520710200);the National Key R&D Program of China(grant no.2021YFA1501600);the Innovation Program of Shanghai Municipal Education Commission(grant no.2019-01-07-00-05-E00012);W.W.acknowledges the financial support by the National Natural Science Foundation of China(grant no.22001073);the Natural Science Foundation of Shanghai(grant no.23ZR1419600);L.H.acknowledges the financial support by the National Nature Science Foundation of China(grant no.22103062);the Shanghai Pujiang Program(grant no.22PJ1402800);the Fundamental Research Funds for the Central Universities;X.-Q.W.acknowledges the financial support by the National Natural Science Foundation of China(grant no.22201077);W.-J.L.is grateful to the China Postdoctoral Science Foundation(grant nos.BX2021103 and 2021M700044)for financial support.

摘　　要：Artificial molecular muscles undergo well-controlled contractile and extensile motions upon external stimulation,leading to remarkable length changes.Evaluating such length changes at the molecular level is essential to the design of integrated artificial molecular muscles that mimic biological muscles.Taking advantage of the strong contrast of platinum(Pt)atoms in high-angle annular dark-field scanning transmission electron microscopy images,we imaged Pt-containing molecular[c2]daisy chains directly by employing metal atom markers.The length changes and associated conformational transformations of these newly developed artificial molecular muscles have been measured experimentally in combination with theoretical calculations.The contraction ratios of these two molecular muscles with the TEMPO or pyrene anchoring group were calculated to be 21.0%or 15.7%respectively,suggesting a substantial anchoring effect.This study demonstrates the experimental measurement of the length changes of artificial molecular muscles and provides a new avenue for investigating the motion of artificial molecular machines.

关 键 词：mechanically interlocked molecules molecular[c2]daisy chain artificial molecular machines high-angle annular dark-field scanning transmission electron microscopy stimuli responsiveness 

分 类 号：O64[理学—物理化学]