Journal
CHEMISTRY OF MATERIALS
Volume 34, Issue 5, Pages 2449-2457Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.2c00089
Keywords
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Funding
- FRQNT
- Ji l i n Normal University
- Canada Research Chairs program
- NSERC
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Three types of moire patterns were observed on HOPG, with the incommensurate gamma-pattern being more stable than the commensurate alpha- and beta-patterns. The stability of the gamma-pattern can be explained by the presence of a static distortion wave exclusively observed in this pattern. Lateral relaxation of the TCPB lattice reduces the free energy of the gamma-pattern compared to the alpha- and beta-moire patterns.
Three types of moire patterns, denoted as alpha-, beta-, and gamma-patterns, were observed in the molecular self-assembly of 1,3,5-tris(4-cyanophenyl)benzene (TCPB) on HOPG. Their relative stability was studied through thermally induced phase transitions monitored in situ by scanning tunneling microscopy. The incommensurate gamma-pattern is thermodynamically more stable than the commensurate alpha- and beta-patterns. The preference in the gamma-pattern was explained by a static distortion wave, which was exclusively observed in this pattern. Through the lateral relaxation of TCPB lattice, the free energy of the gamma-pattern can be reduced with respect to that of the alpha- and beta-moire patterns. This investigation provides insights into the thermodynamics of surface-confined supramolecular systems where the molecular lattice is incongruent with the substrate.
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