Structure transformation from Sierpiński triangles to chains assisted by gas molecules  

作　　者：Chao Li Zhen Xu Yajie Zhang Jie Li Na Xue Ruoning Li Mingjun Zhong Tianhao Wu Yifan Wang Na Li Ziyong Shen Shimin Hou Richard Berndt Yongfeng Wang Song Gao 

机构地区：[1]Center for Carbon-based Electronics andKey Laboratory for the Physics and Chemistry of Nanodevices,Schoolof Electronics,Peking University,Beijing 100871,China [2]Institut fur Experimentelle und Angewandte Physik,Christian-Albrechts-Universitatzu Kiel,Kiel 24098,Germany [3]Central Laboratory,Tianjin Key Laboratory of Epigenetics for Organ Development in Preterm Infants,the Fifth Central Hospital of Tianjin,Tianjin 300450,China [4]Institute of Spin Science and Technology,South China University of Technology,Guangzhou 511442,China

出　　处：《National Science Review》2023年第7期146-153,共8页国家科学评论（英文版）

基　　金：supported by the Ministry of Science and Technology of China(2018YFA0306003);National Natural Science Foundation of China(22132007,21991132,21972002,22225202,22172002 and 21902003)。

摘　　要：Reversible transformations between fractals and perio dic structures are of fundamental importance for understanding the formation mechanism of fractals.Currently,it is still a challenge to controllably achieve such a transformation.We investigate the effect of CO and CO_(2)molecules on Sierpiński triangles(STs)assembled from Fe atoms and 4,4″-dicyano-1,1′:3′,1″-terphenyl(C3PC)molecules on Au surfaces.Using scanning tunneling microscopy,we discover that the gas molecules induce a transition from STs into 1D chains.Based on density functional theory modeling,we propose that the atomistic mechanism involves the transformation of a stable 3-fold coordination Fe(C3PC)_(3)motif to Fe(C3PC)_(4)with an axially bonded CO molecule.CO_(2)causes the structural transformation through a molecular catassembly process.

关 键 词：scanning probe microscopy fractals metal-organic motifs CO Sierpiński triangles 

分 类 号：O641.4[理学—物理化学]