Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Poster: Nanostructures on Surfaces I

O 49.5: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

2D Nanoporous Chiral Supramolecular Networks Steered by Two σ-hole Interactions of S-Br & Br-Br. — •Lingbo Xing¹, Zhichao Huang¹, Jingxin Dai¹, Zhaohui Wang², and Kai Wu¹ — ¹College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China — ²Key Laboratory of Organic Solid, Chinese Academy of Sciences, Beijing 100190, China.

A variety of weak interactions such as hydrogen bonds, dipole-dipole interactions, van der Waals interactions, and metal-ligand coordination have been employed to assemble 2D nanoporous supramolecular networks at surfaces. σ-hole bond is a noncovalent interaction between a covalently-bonded atom of Groups IV-VII and a negative site, e.g. a lone pair of a Lewis base or an anion. Halogen bonding is a subset of σ-hole interactions. In this study, self-assembly behaviors of 3,10-dibromo-perylo[1,12-b,c,d]thiophene (2BPET) on Ag(111) will be discussed by means of scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. For the first time, S-Br σ-hole interactions act as the driven force of molecular assembly on metal surfaces. Three types of porous chiral assembly phases can be fabricated under different coverage and deposition temperature steered by S-Br and Br-Br. Combined with DFT calculations, it turns out that S-Br is more thermodynamic stable.