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On-surface synthesis of nitrogen-doped nanographene with an [18]annulene pore on Ag(111).
- Source :
-
Communications Chemistry . 10/20/2023, Vol. 6 Issue 1, p1-7. 7p. - Publication Year :
- 2023
-
Abstract
- On-surface synthesis is of importance to fabricate low dimensional carbon-based nanomaterials with atomic precision. Here, we synthesize nitrogen-doped nanographene with an [18]annulene pore and its dimer through sequential reactions of debromination, aryl–aryl coupling, cyclodehydrogenation and C–N coupling on Ag(111) from 3,12-dibromo-7,8-diaza[5]helicene. The inner structures of the products were characterized with scanning tunneling microscopy with a CO terminated tip at low temperature. Furthermore, the first four unoccupied electronic states of the nanographene were investigated with a combination of scanning tunneling spectroscopy and theoretical calculations. Except for the LUMO + 2 state observed at +1.3 V, the electronic states at 500 mV, 750 mV and 1.9 V were attributed to the superatom molecular orbitals at the [18]annulene pore, which were significantly shifted towards the Fermi level due to the hybridization with the confined surface state. On-surface synthesis is a key tool to access low dimensional carbon-based nanomaterials with atomic precision. Here, the authors synthesize a nitrogen-doped nanographene structure with an [18]annulene pore on Ag(111) through sequential debromination, aryl–aryl coupling, cyclodehydrogenation and C–N coupling reactions from a 3,12-dibromo-7,8-diaza[5]helicene precursor. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 23993669
- Volume :
- 6
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Communications Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 173149983
- Full Text :
- https://doi.org/10.1038/s42004-023-01023-z