Two-dimensional delocalized states in organometallic bis-acetylide networks on Ag(111). Issue 8 (7th February 2018)

• Record Type: Journal Article
• Authors: Yang, Zechao; Gebhardt, Julian; Schaub, Tobias A.; Sander, Tim; Schönamsgruber, Jörg; Soni, Himadri; Görling, Andreas; Kivala, Milan; Maier, Sabine
• Is Part Of: Nanoscale. Volume 10:Issue 8(2018)
• Page Start: 3769
• Page End: 3776
• Publication Date: 2018-02-07
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c7nr08238j
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Scanning tunneling spectroscopy and density-functional theory reveal an unoccupied electronic state that is delocalized along the entire organometallic Ag-bis-acetylide network. Abstract : The electronic structure of surface-supported organometallic networks with Ag-bis-acetylide bonds that are intermediate products in the bottom-up synthesis of graphdiyne and graphdiyne-like networks were studied. Scanning tunneling microscopy (STM) and spectroscopy (STS) reveal a frontier, unoccupied electronic state that is delocalized along the entire organometallic network and proves the covalent nature of the Ag-bis-acetylide bonds. Density-functional theory (DFT) calculations corroborate the spatial distribution of the observed delocalized state and attribute it to band mixing of carbon and silver atoms combined with n-doping of the metal surface. The metal-bis-acetylide bonds are typical metal–organic bonds with mixed character containing covalent and strong ionic contributions. Moreover, the organometallic networks exhibit a characteristic graphene-like band structure with linear band dispersion at each K point.