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  Importance of Long-Term Storage for Fluorine-Substituted Aromatic Self-Assembled Monolayers by the Example of 4-Fluorobenzene-1-Thiolate Films on Au(111)

Azzam, W., Sauter, E., Alrashdi, A. A., Al-Refaie, N., Rohwerder, M., Bashir, A., et al. (2019). Importance of Long-Term Storage for Fluorine-Substituted Aromatic Self-Assembled Monolayers by the Example of 4-Fluorobenzene-1-Thiolate Films on Au(111). The Journal of Physical Chemistry C, 123(7), 4308-4318. doi:10.1021/acs.jpcc.8b12030.

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 Creators:
Azzam, Waleed1, 2, Author           
Sauter, Eric3, Author           
Alrashdi, Awad A.1, Author           
Al-Refaie, Najd4, Author           
Rohwerder, Michael5, Author           
Bashir, Asif5, Author           
Zharnikov, Michael6, Author           
Affiliations:
1Department of Chemistry, University College in Al-Qunfudah, Umm Al-Qura University, 1109 Makkah Al-Mukarramah, Saudi Arabia, ou_persistent22              
2Department of Chemistry, Tafila Technical University, P.O. Box 179, 66110 Tafila, Jordan, ou_persistent22              
3Universitat Heidelberg, Applied Physical Chemistry, Heidelberg, Germany, ou_persistent22              
4Department of Chemistry, University College in Al-Qunfudah, Umm Al-Qura University, Makkah Al-Mukarramah, Saudi Arabia, ou_persistent22              
5Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
6Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, Heidelberg, Germany, ou_persistent22              

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Free keywords: Aromatic compounds; Aromatization; Film preparation; Fluorine; Organic polymers; Phase transitions, Aromatic self assembled monolayers; Disordered phase; Kinetic factors; Long-term storage; Morphological transformations; Orientational orderings; Structural ordering; Substituted aromatic, Self assembled monolayers
 Abstract: By the example of 4-fluorobenzene-1-thiolate (p-FTP) films on Au(111), we show that a long-term post-preparation storage can improve significantly the quality of fluorinated aromatic self-assembled monolayers (SAMs). Whereas the freshly prepared p-FTP films exhibit a polymorphism, with a dominance of a disordered phase, the post-preparation storage triggers a gradual phase transition to a single-phase SAM of exceptional quality. This phase is characterized by the commensurate (16 × √3) structure, a molecular footprint of 23.1 Å 2 , high orientational order, and hardly perceptible borders between individual domains, with sizes exceeding 80 nm. Significantly, the phase transition is accompanied by morphological transformation of the substrate: whereas the freshly prepared films exhibit comparably large Au adatom islands, typical of aromatic SAMs, the long-storage samples rather reveal etch-pits, typical of alkanethiolate SAMs on Au(111), which generally have a high structural order immediately after the preparation. The above results suggest a deep interrelation between the structural order in the SAMs and surface morphology. A further implication is the importance of both thermodynamic and kinetic factors, a delicate interplay of which is presumably responsible for the observed evolution of p-FTP/Au in the present case. © Copyright 2019 American Chemical Society.

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Language(s): eng - English
 Dates: 2019-02-01
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpcc.8b12030
 Degree: -

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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 123 (7) Sequence Number: - Start / End Page: 4308 - 4318 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766