Low-Dimensional Metal–Organic Coordination Structures on Graphene

Abstract

We report the formation of one- and two-dimensional metal–organic coordination structures from para-hexaphenyl-dicarbonitrile (NC–Ph6–CN) molecules and Cu atoms on graphene epitaxially grown on Ir(111). By varying the stoichiometry between the NC–Ph6–CN molecules and Cu atoms, the dimensionality of the metal–organic coordination structures could be tuned: for a 3:2 ratio, a two-dimensional hexagonal porous network based on threefold Cu coordination was observed, while for a 1:1 ratio, one-dimensional chains based on twofold Cu coordination were formed. The formation of metal–ligand bonds was supported by imaging the Cu atoms within the metal–organic coordination structures with scanning tunneling microscopy. Scanning tunneling spectroscopy measurements demonstrated that the electronic properties of NC–Ph6–CN molecules and Cu atoms were different between the two-dimensional porous network and one-dimensional molecular chains.

Tuning the Magnetic Anisotropy of Lanthanides on a Metal Substrate by Metal–Organic Coordination

“…Such finding might reveal a partial covalent nature of the coordinative Dy‐carboxylate interaction. [ 23,24 ] At this stage, it is worth to point out that the metal–organic coordination based on a lanthanide bond is universally considered to be predominantly ionic, due to the internal location of the f‐valence electrons, though there is always a certain degree of covalence, [ 2,19 ] which is clearly observed here for the Dy‐TDA network. Our insights are corroborated by the calculated charge density difference plots (see Figure 2g–i and Section III, Supporting Information, for detailed analysis).…”

Synthesis and Local Probe Gating of a Monolayer Metal‐Organic Framework

“…More crucially, existing work only demonstrates order on a local scale with very small domain sizes of the MOF. [ 1,26–30 ] The characterization of single layer MOFs in a gated device environment has not been realized yet, since it is even more challenging to fabricate 2D MOFs on a three‐terminal device. However, this could be alternatively achieved by gating the 2D MOFs using local electric fields induced by the tip of a scanning probe microscope.…”

Transformation of the coordination nanostructures of 4,4′,4′′-(1,3,5-triazine-2,4,6-triyl) tribenzoic acid molecules on HOPG triggered by the change in the concentration of metal ions

“…The coordination-driven molecular self-assembly of nanostructures on solid surfaces has attracted much attention owing to the potential applications of such structures in nanodevices and nanopatterning in the future. [1][2][3][4] Recently, coordination interaction has been used in the direct preparation of novel nanostructures ranging from clusters, 5,6 1D chains or polymers, [7][8][9][10] to 2D coordination frameworks, [11][12][13][14] and even 3D structures. [15][16][17] Moreover, their composition, morphology and properties have been well proved, and have opened up specic and targeted application in the areas of chemical and materials sciences.…”