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240808s2024 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.4c02528
|2 doi
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|a pubmed24n1507.xml
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|a DE-627
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|a eng
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| 100 |
1 |
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|a Zhang, Zhipeng
|e verfasserin
|4 aut
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|a Identifying Target Molecule and Trace Amount of the Byproduct by Two-Dimensional Self-Assembly with Different Solution Concentrations
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|c 2024
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.08.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Scanning tunneling microscopy (STM) is a powerful way to realize the recognition of self-assembled nanostructures on the atomic scale. In this article, dihexadecyl 6,9-bis((4-(hexadecyloxy)phenyl)ethynyl) phenanthro[9,10-c]thiophene-1,3-dicarboxylate (D-PT) and dihexadecyl 6-bromo-9-((4-(hexadecyloxy) phenyl)ethynyl)phenanthrol[9,10-c]thiophene-1,3-dicarboxylate (S-BrPT) with different substituents were chosen as the target system. D-PT with four side chains as the target molecule and S-BrPT with three side chains and a bromine substituent as the byproduct were mixed in a molar concentration ratio of 20:1. The effect of solution concentration on the molecular self-assembly of the mixture was investigated by STM at the hexadecane/HOPG interface. At high concentrations, only D-PT molecules formed a dimer pattern resulting from the intermolecular van der Waals force and self-adaption. Further diluting the solution, D-PT formed the coexisting dimer and linear structures, in which the linear pattern was formed via solvent coadsorption. At low concentrations, S-BrPT molecules forming N-shaped dimers appeared and filled the linear structure fabricated by D-PT molecules. With further decrease in the concentration, S-BrPT molecules formed N-shaped dimers covering almost half of the surface area, resulting from the C-Br···π and Br···H-C bonds. At very low concentrations, S-BrPT molecules formed N-shaped dimers to arrange the matrix architecture due to the coadsorption of more hexadecane molecules. Density functional theory (DFT) calculations demonstrated that the stronger intermolecular C-Br···π and Br···H-C bonds were significant factors in determining the formation of N-shaped dimers and the stability of this nanostructure. This work enriches the diversity of self-assembled motifs and provides a strategy to characterize different symmetric molecules with trace amounts in a mixed system by STM
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|a Journal Article
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|a Zhao, Xiaoyang
|e verfasserin
|4 aut
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|a Miao, Xinrui
|e verfasserin
|4 aut
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| 700 |
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|a Deng, Wenli
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 40(2024), 33 vom: 20. Aug., Seite 17826-17834
|w (DE-627)NLM098181009
|x 1520-5827
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| 773 |
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|g volume:40
|g year:2024
|g number:33
|g day:20
|g month:08
|g pages:17826-17834
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|u http://dx.doi.org/10.1021/acs.langmuir.4c02528
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