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Thioetherification of Br-Mercaptobiphenyl Molecules on Au(111)
Ana Barragán1,2,3, Roberto Robles3, Nicolás Lorente1,3
1Donostia International Physics Center (DIPC), Paseo M Lardizabal 4, 20018 San Sebastián, Spain.
This study demonstrates thermal annealing for thioether polymer synthesis. Key steps involve simultaneous dehalogenation and S-Au bond dissociation for C-S bond formation on Au(111).
Area of Science:
- Materials Science
- Surface Chemistry
- Polymer Chemistry
Background:
- Thioether polymers are crucial for diverse applications.
- Their synthesis is challenging due to sulfur atom detachment during thermal activation.
- Understanding reaction mechanisms is vital for efficient polymer formation.
Purpose of the Study:
- To investigate the thermal annealing process for thioether polymer synthesis.
- To elucidate the reaction pathway of 4-bromo-4-mercaptobiphenyl (Br-MBP) on Au(111).
- To identify critical steps for forming intermolecular C-S bonds over C-C bonds.
Main Methods:
- Utilized scanning tunneling microscopy (STM) and spectroscopy.
- Employed first-principle calculations for theoretical analysis.
- Investigated the adsorption and thermal annealing of Br-MBP on Au(111).
Main Results:
- Unambiguously demonstrated thioetherification of Br-MBP on Au(111) via thermal annealing.
- Identified four key reaction steps involving sulfhydryl and bromine functional groups.
- Determined that simultaneous dehalogenation and S-Au bond dissociation are essential for polymer formation.
- Analyzed electronic properties of C-S bonds and polymers based on ligand length.
Conclusions:
- Established a viable surface-assisted synthesis route for thioether polymers.
- Provided mechanistic insights into overcoming C-C bond formation competition.
- Highlighted the importance of specific bond dissociation dynamics for polymer chain growth.
- Opened new perspectives for thioether polymer chemical synthesis.
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