期刊
ACS NANO
卷 12, 期 12, 页码 11917-11927出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07225
关键词
scanning tunneling microscopy; scanning tunneling spectroscopy; open-shell polycyclic aromatic hydrocarbons; nonalternant polycyclic aromatic hydrocarbons; atom manipulation; density functional theory
类别
资金
- Swiss National Science Foundation [162857]
- NCCR MARVEL - Swiss National Science Foundation [51NF40-182892]
- European Union's Horizon 2020 research and innovation programme [785219]
- Office of Naval Research BRC Program [N00014-12-1-1009]
- DFG-NSFC Joint Sino-German Research Project (EnhanceNano grant) [391979941]
- Center for Advancing Electronics Dresden (cfaed)
- European Social Fund (ESE Project GRAPHD, TU Dresden) [100270084]
- Federal State of Saxony (ESE Project GRAPHD, TU Dresden) [100270084]
- PRACE project [2016153518]
Polycyclic aromatic hydrocarbons exhibit a rich spectrum of physicochemical properties depending on the size and, more critically, on the edge and bond topologies. Among them, open-shell systems- molecules hosting unpaired electron densities-represent an important class of materials for organic electronic, spintronic, and optoelectronic devices, but remain challenging to synthesize in solution. We report the on-surface synthesis and scanning tunneling microscopy- and spectroscopy-based study of two ultralow-gap open-shell molecules, namely peri-tetracene, a benzenoid graphene fragment with zigzag edge topology, and dibenzo [a,m]dicyclohepta[bcde,nopq]rubicene, a nonbenzenoid nonalternant structural isomer of peri-tetracene with two embedded azulene units. Our results provide an understanding of the ramifications of altered bond topologies at the single-molecule scale, with the prospect of designing functionalities in carbon-based nanostructures via engineering of bond topology.
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