期刊
ACS NANO
卷 6, 期 1, 页码 549-556出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn203963a
关键词
supramolecular chemistry; self-assembly; molecular dynamics; hierarchic bonding; scanning tunneling microscopy (STM); density functional theory (DFT)
类别
资金
- European Union via ERC [247299]
- German Research Foundation (DFG) through TUM International Graduate School of Science and Engineering (IGSSE)
- TUM Institute of Advanced Study (IAS)
- German Research Foundation (DFG) [BA 3395/2-1]
- Alexander von Humboldt Foundation
The assembly and dynamics of a hierarchical, bimolecular network of sexiphenyl dicarbonitrile and N,N'-diphenyl oxalic amide molecules on the Ag(111) surface are studied by scanning tunneling microscopy at controlled temperature. The network formation is governed by a two-step protocol involving hierarchic interactions, including a novel carbonitrile-oxalic amide bonding motif. For temperatures exceeding similar to 70 K, more weakly bound sexiphenyl dicarbonitrile molecules carry out one-dimensional diffusion guided by the more stable substructure of the network held together by the carbonitrile-oxalic amide bonding motif. A theoretical investigation at the ab initio level confirms the different binding energies of the two coupling motifs and rationalizes the network formation and the diffusion pathway.
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