التفاصيل البيبلوغرافية
| العنوان: |
On-Surface Synthesis of Porous Carbon Nanoribbons from Polymer Chains |
| المؤلفون: |
Maximilian Ammon, Sabine Maier, Tim Sander |
| المصدر: |
Journal of the American Chemical Society |
| سنة النشر: |
2017 |
| مصطلحات موضوعية: |
chemistry.chemical_classification, Nanoporous, scanning probe microscopy, 02 engineering and technology, General Chemistry, Polymer, 010402 general chemistry, 021001 nanoscience & nanotechnology, Ring (chemistry), Photochemistry, 01 natural sciences, Biochemistry, Catalysis, 0104 chemical sciences, Colloid and Surface Chemistry, chemistry, Polymerization, Phenylene, Dehydrogenation, on-surface synthesis, 0210 nano-technology, Selectivity, Isomerization |
| الوصف: |
We demonstrate the on-surface synthesis of porous carbon nanoribbons on Ag(111) via a preprogrammed isomerization of conformationally flexible polymer chains followed by dehydrogenation reactions using thermal annealing. The carbon chains are fabricated by polymerization of prochiral 1,3,5-tris(3-bromophenyl)benzene (mTBPB) directly on the surface using an Ullmann-type reaction. At room temperature, mTBPB partially self-assembles in halogen-bonded 2D networks, which transform into organometallic chains and rings after debromination. The chain and ring formation is facilitated by conformational switching from a C3h to Cs symmetry of mTBPB via rotation of m-phenylene units. The high conformational selectivity toward Cs-conformers is templated by the twofold coordination to Ag adatoms. After thermally induced covalent-linking through aryl–aryl coupling, well-ordered nanoporous chains are created. Finally, the rotation of single phenylene units in combination with dehydrogenation cross-linking reactions within the polymer chains leads to the unexpected formation of porous carbon nanoribbons. We unveil the reaction mechanism in a low-temperature scanning tunneling microscopy study and demonstrate that the rotation of m-phenylene units is a powerful design tool to promote structural control in the synthesis of cyclic covalent organic nanostructures on metal surfaces. |
| تدمد: |
0002-7863 |
| DOI: |
10.1021/jacs.7b04783 |
| URL الوصول: |
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3d146aca0773d110421ebb81fbe5e63 |
| Rights: |
OPEN |
| رقم الانضمام: |
edsair.doi.dedup.....a3d146aca0773d110421ebb81fbe5e63 |
| قاعدة البيانات: |
OpenAIRE |