Yang Zhan-Yong, Sang Xiao, Liu Dong, Li Qiu-Yi, Lang Feifan, Abrahams Brendan F, Hou Hongwei, Braunstein Pierre, Lang Jian-Ping
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, Jiangsu, P. R. China.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, P. R. China.
Angew Chem Int Ed Engl. 2023 May 8;62(20):e202302429. doi: 10.1002/anie.202302429. Epub 2023 Apr 7.
We report a unique vinyl coordination polymer (CP), [Zn(4-Fb) (tkpvb)] (1, 4-HFb=4-fluorobenzoic acid, tkpvb=1,2,4,5-tetrakis(4-pyridylvinyl)benzene) that undergoes a rare photopolymerization reaction to form a two-dimensional CP integrated with a one-dimensional linear organic polymer. Upon light irradiation at different wavelengths, 1 exhibits an unprecedented phenomenon of photoinduced nonlinear lattice expansion. 1 can be uniformly dispersed in polyvinyl alcohol (PVA) to form the composite film of 1-PVA. When this film is exposed to UV light, internal minute stresses within crystallites are released by lattice expansion, resulting in a variety of photopolymerization-driven macroscopic mechanical motions. The findings provide new insights into the conversion of small lattice expansions of CPs into macroscopic mechanical motions based on photopolymerization reactions, which can promote the development of CPs-based smart photoactuators in the burgeoning field of microrobotics.
我们报道了一种独特的乙烯基配位聚合物（CP），即[Zn(4-Fb) (tkpvb)]（1，4-HFb = 4-氟苯甲酸，tkpvb = 1,2,4,5-四（4-吡啶基乙烯基）苯），它会发生罕见的光聚合反应，形成一种与一维线性有机聚合物整合的二维CP。在不同波长的光照下，1表现出前所未有的光致非线性晶格膨胀现象。1可以均匀分散在聚乙烯醇（PVA）中，形成1-PVA复合膜。当该膜暴露于紫外光时，微晶内部的微小应力通过晶格膨胀得以释放，从而导致各种光聚合驱动的宏观机械运动。这些发现为基于光聚合反应将CP的小晶格膨胀转化为宏观机械运动提供了新的见解，这可以促进在新兴的微型机器人领域中基于CP的智能光致动器的发展。
