Coverage-dependent disorder-to-order phase transformation of a uracil derivative on Ag(111)

Mihaela Enache, Laura Maggini, Anna Llanes-Pallas, Thomas A. Jung, Davide Bonifazi, Meike Stöhr

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The self-organization of an angular bis(uracil-ethynyl) benzene derivative is investigated on Ag(111) by means of scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. It is found-starting at low submonolayer coverage-that upon increasing the molecular coverage a disorder-to-order phase transformation occurs. Specifically, at low and intermediate molecular coverage a glassy phase consisting of one-dimensional (1D) chains and 2D aggregates is observed, while close to a first complete molecular layer, a well-ordered 2D close-packed phase is revealed. The main driving forces responsible for the structure formation are (i) the high self-complementarity of the uracil (U) moiety, resulting in U-U homopairs through 2-fold C=O⋯H-N H-bonds and (ii) the steric hindrance induced in the system by the alkyl chains. The delicate balance between the molecule-molecule and the molecule-substrate interactions leads to a complex phase behavior of the uracil derivative at the solid-vacuum interface. On the basis of this detailed study, we present a qualitative understanding of the peculiar phase behavior of the system.

langue originaleAnglais
Pages (de - à)15286-15291
Nombre de pages6
journalJournal of Physical Chemistry C
Volume118
Numéro de publication28
Les DOIs
étatPublié - 17 juil. 2014

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uracil
Uracil
phase transformations
Phase transitions
disorders
Phase behavior
Derivatives
Molecules
Benzene Derivatives
molecules
Ultrahigh vacuum
Scanning tunneling microscopy
ultrahigh vacuum
scanning tunneling microscopy
Benzene
benzene
Vacuum
vacuum
Substrates
interactions

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Enache, Mihaela ; Maggini, Laura ; Llanes-Pallas, Anna ; Jung, Thomas A. ; Bonifazi, Davide ; Stöhr, Meike. / Coverage-dependent disorder-to-order phase transformation of a uracil derivative on Ag(111). Dans: Journal of Physical Chemistry C. 2014 ; Vol 118, Numéro 28. p. 15286-15291.
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abstract = "The self-organization of an angular bis(uracil-ethynyl) benzene derivative is investigated on Ag(111) by means of scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. It is found-starting at low submonolayer coverage-that upon increasing the molecular coverage a disorder-to-order phase transformation occurs. Specifically, at low and intermediate molecular coverage a glassy phase consisting of one-dimensional (1D) chains and 2D aggregates is observed, while close to a first complete molecular layer, a well-ordered 2D close-packed phase is revealed. The main driving forces responsible for the structure formation are (i) the high self-complementarity of the uracil (U) moiety, resulting in U-U homopairs through 2-fold C=O⋯H-N H-bonds and (ii) the steric hindrance induced in the system by the alkyl chains. The delicate balance between the molecule-molecule and the molecule-substrate interactions leads to a complex phase behavior of the uracil derivative at the solid-vacuum interface. On the basis of this detailed study, we present a qualitative understanding of the peculiar phase behavior of the system.",
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Coverage-dependent disorder-to-order phase transformation of a uracil derivative on Ag(111). / Enache, Mihaela; Maggini, Laura; Llanes-Pallas, Anna; Jung, Thomas A.; Bonifazi, Davide; Stöhr, Meike.

Dans: Journal of Physical Chemistry C, Vol 118, Numéro 28, 17.07.2014, p. 15286-15291.

Résultats de recherche: Contribution à un journal/une revueArticle

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