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  Promoting Effect of Protecting Group on the Structure and Morphology of Self-Assembled Mono layers: Terphenylylethanethioactate on Au(111)

Bashir, A., Iqbal, D., Jain, S. M., Barbe, K., Abu-Husein, T., Rohwerder, M., et al. (2015). Promoting Effect of Protecting Group on the Structure and Morphology of Self-Assembled Mono layers: Terphenylylethanethioactate on Au(111). The Journal of Physical Chemistry C, 119(45), 25352-25363. doi:10.1021/acs.jpcc.5b06813.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-77D4-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-77E9-5
Genre: Journal Article

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 Creators:
Bashir, Asif1, Author              
Iqbal, Danish2, Author              
Jain, Sagar Motilal3, 4, Author              
Barbe, Kathrin5, Author              
Abu-Husein, Tarek5, Author              
Rohwerder, Michael1, Author              
Terfort, Andreas6, Author              
Zharniko, Michael3, Author              
Affiliations:
1Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
2Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              
3Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, Heidelberg, Germany, ou_persistent22              
4Ångström Laboratory, Department of Chemistry, Uppsala University, Box 523, Uppsala, Sweden, ou_persistent22              
5Institut für Anorganische und Analytische Chemie, Universität Frankfurt, Max-von-Laue-Straße 7, Frankfurt, Germany, ou_persistent22              
6Institute of Inorganic and Analytical Chemistry, Goethe-University, D-60438 Frankfurt, Germany, ou_persistent22              

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Free keywords: Image acquisition; Monolayers; Morphology; Organic polymers; Reaction kinetics; Scanning tunneling microscopy
 Abstract: Taking self-assembled monolayers (SAMs) of 4,4'-terphenylyl-substituted ethanethioacetate (TP2-SAc) on Au(111) as a test system, we studied the effect of the protecting group on the structure and morphology of this monolayer. The films were prepared at both room (298 K) and elevated (333 K) temperature, at either the presence or absence of a deprotecting agent, viz., triethylamine. The presence of the protecting group resulted in distinctly different crystallographic structure, described by the (2 root 3 x 4) red unit cell, in all SAMs studied as compared to the case of the nonprotected analogue. The molecules within this unit cell were arranged in a herringbone fashion as could be observed by variation of the scan direction during the image acquisition by scanning tunneling microscopy. Most important and in contrast to previous studies of similar systems, the presence of the protecting group led to significant improvement of the SAM morphology in the case of preparation at 333 K, resulting in formation of comparably large domains with dimensions exceeding 100 nm. The effect of the deprotecting agent was found to be small when preparing at 298 K and hardly perceptible at 333 K. Determination of the reaction kinetics gave evidence of a completely different reaction mechanism for the thioacetate as compared to the thiol, which presumably is responsible for the observed differences.

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Language(s): eng - English
 Dates: 2015-11-12
 Publication Status: Published in print
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000364796300024
DOI: 10.1021/acs.jpcc.5b06813
 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 DC : American Chemical Society
Pages: - Volume / Issue: 119 (45) Sequence Number: - Start / End Page: 25352 - 25363 Identifier: ISSN: 1932-7447
CoNE: /journals/resource/954926947766