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Surface supported gold-organic hybrids: on-surface synthesis and surface directed orientation
Haiming Zhang1, Jörn-Holger Franke, Dingyong Zhong
1Physikalisches Institut, Universität Münster, Wilhelm-Klemmstrasse 10, 48149 Münster, Germany, Center for Nanotechnology (CeNTech), Heisenbergstrasse 11, 48149, Münster, Germany.
Small (Weinheim an Der Bergstrasse, Germany)
|November 15, 2013
Summary
Researchers created gold-organic hybrid materials on gold surfaces using perylene-3,4,9,10-tetracarboxylic acid bisimides (PBIs). This novel synthesis method involves dehalogenation and results in surface-directed alignment of the hybrid chains.
Area of Science:
- Materials Science
- Surface Chemistry
- Organic Chemistry
Background:
- Gold-organic hybrids are of interest for advanced material applications.
- Controlling the synthesis and self-assembly of such hybrids on surfaces is crucial.
- Perylene-3,4,9,10-tetracarboxylic acid bisimides (PBIs) are versatile organic building blocks.
Purpose of the Study:
- To report the surface-assisted synthesis of gold-organic hybrids on Au (111) and Au (100) surfaces.
- To investigate the structures and surface-directed alignment of gold-PBI chains.
- To elucidate the mechanism of gold-PBI dimer formation.
Main Methods:
- Thermally initiated dehalogenation of chloro-substituted PBIs on Au surfaces.
- Scanning tunnelling microscopy (STM) in ultra-high vacuum (UHV) conditions.
- Density functional theory (DFT) calculations.
Main Results:
- Successful synthesis of gold-organic hybrids on Au (111) and Au (100) surfaces.
- Observation of surface-directed alignment of Au-PBI chains.
- Elucidation of the formation mechanism: PBI radical formation, covalent binding to surface gold, and partial extraction of gold atoms.
Conclusions:
- Surface-assisted dehalogenation is an effective route for synthesizing gold-organic hybrids.
- The mechanism involves radical intermediates and covalent bond formation with surface gold atoms.
- This method enables controlled assembly and alignment of hybrid chains on reconstructed gold surfaces.
