Journal
CHEMISTRY-SWITZERLAND
Volume 4, Issue 1, Pages 112-117Publisher
MDPI
DOI: 10.3390/chemistry4010009
Keywords
on-surface synthesis; AFM; STM; DFT calculations
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [RE2669/6, PA3628/1]
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This study demonstrates the selective on-surface synthesis of extended all-trans poly(2,6-pyridine) chains on Au(111). By using high-resolution scanning tunneling and atomic force microscopy, the detailed chemical structure of the reaction products was revealed. Density functional theory calculations suggest that the synthesis of extended covalent structures is energetically favored over the formation of macrocycles due to the minimization of internal strain.
Strain-induced on-surface transformations provide an appealing route to steer the selectivity towards desired products. Here, we demonstrate the selective on-surface synthesis of extended all-trans poly(2,6-pyridine) chains on Au(111). By combining high-resolution scanning tunneling and atomic force microscopy, we revealed the detailed chemical structure of the reaction products. Density functional theory calculations indicate that the synthesis of extended covalent structures is energetically favored over the formation of macrocycles, due to the minimization of internal strain. Our results consolidate the exploitation of internal strain relief as a driving force to promote selective on-surface reactions.
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