On-Surface Synthesis of Two-Dimensional Covalent Organic Structures versus Halogen-Bonded Self-Assembly: Competing Formation of Organic Nanoarchitectures
On-Surface Synthesis of Two-Dimensional Covalent Organic Structures versus Halogen-Bonded Self-Assembly: Competing Formation of Organic Nanoarchitectures
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DOI：
10.1021/acsnano.6b01938
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发表时间：
2016-05-01
期刊：
影响因子：
17.1
通讯作者：
Silly, Fabien
中科院分区：
文献类型：
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作者：
Peyrot, David;Silly, Fabien
利用扫描隧道显微镜研究了室温以上真空条件下1，3，5-三（4-碘苯基）苯分子在Au（111）表面上的共价纳米结构与自组装之间的竞争.分子形成共价多边形nanoachitectures在金表面台阶边缘和在肘部的金重建在低覆盖率。随着覆盖率的增加，二维卤素键合结构出现并生长在表面平台上。两种不同的卤素键合纳米结构共存于表面上，并观察到混合共价-卤素键合结构的局部。在高覆盖率下，共价纳米结构在卤素键合结构的域边界处被挤压。共价键和卤素键合的纳米结构之间的竞争性生长导致在一个单层沉积上形成两层膜。对于这种覆盖，共价纳米结构被推进到卤素键合的第一层的顶部。这些观察结果为在真空中将共价纳米结构与催化活性和金属表面解耦开辟了新的机会。
The competition between the on-surface synthesis of covalent nanoarchitectures and the self assembly of star-shaped 1,3,5-Tris(4-iodophenyl)benzene molecules on Au(111) in vacuum is investigated using scanning tunneling microscopy above room temperature. The molecules form covalent polygonal nanoachitectures at the gold surface step edges and at the elbows of the gold reconstruction at low coverage. With coverage increasing two-dimensional halogen-bonded structures appear and grow on the surface terraces. Two different halogen-bonded nanoarchitectures are coexisting on the surface and hybrid covalent-halogen bonded structures are locally observed. At high coverage covalent nanoarchitectures are squeezed at the domain boundary of the halogen-bonded structures. The competitive growth between the covalent and halogen-bonded nanoarchitectures leads to formation of a two-layer film above one monolayer deposition. For this coverage, the covalent nanoarchitectures are propelled on top of the halogen-bonded first layer. These observations open up new opportunities for decoupling covalent nanoarchitectures from catalytically active and metal surfaces in vacuum.