Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Nanostructures at Surfaces: 1D, 2D Structures and Networks
O 68.7: Poster
Wednesday, March 9, 2016, 18:15–20:30, Poster A
Heat-induced formation of 1D and 2D coordination polymers on Au(111) — Tuan Anh Pham1, Fei Song1, Mariza N. Alberti2, Manh-Thuong Nguyen3, Carlo Thilgen2, Francois Diederich2, and •Meike Stöhr1 — 1University of Groningen — 2ETH Zürich — 3International Centre for Theoretical Physics, Trieste
In the fast growing research field of on-surface molecular self-assembly, coordination bonding is considered as an important tool for the construction of low-dimensional molecular networks on metal surfaces. To date, most of the reported metal-ligand coordination units are based on the combination of organic ligands bearing pyridyl, cyano, hydroxyl or carboxyl endgroups and transition-metal atoms such as Cu, Fe, Co or Ni. However, the construction of such MOFs on Au surfaces with native Au atoms is hardly reported. Here, we show that MOFs comprising porphyrin derivatives can be formed on Au(111) upon annealing. Both a threefold and a fourfold coordination motif stabilizing the MOFs were found. These findings were compared to MOFs made from the same porphyrin derivatives and Co atoms. For this, Co atoms and porphyrin derivatives were deposited on Au(111).[1] In both cases, the same structures were observed what evidences that indeed a coordination bonding is formed between the cyano groups and gold atoms. Moreover, we also investigated the influence of the position of the substituents (cis- vs. trans-isomers) on the MOF formation on Au(111). We could successfully demonstrate that the dimensionality of the MOF can be tuned from 1D to 2D depending on the chosen isomer.
[1] T.A. Pham et al., Chem. Commun. 51 (2015) 14473