Adsorption of Nile Red Self-Assembled Monolayers on Au(111)

Oreste De Luca*, Tommaso Caruso, Marco Turano, Andreea Ionescu, Nicolas Godbert, Iolinda Aiello, Mauro Ghedini, Vincenzo Formoso, Raffaele Giuseppe Agostino

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The ability of Nile Red to self-assemble into supramolecular packings on Au(111) was studied using scanning tunneling microscopy and modeled through theoretical semiempirical calculations. At both submonolayer (sub-ML) and ML coverages, two distinct molecular packings, that is, four-leaf clover and dense chain, were observed, both weakly interacting with the underlying metal surface. Theoretical calculations suggested that the dipole moment plays a subtle role in both molecular assemblies, held together by hydrogen bonds between the Nile Red molecules. Furthermore, although both molecular assemblies were observed in as-deposited samples, a mild thermal annealing caused the transition from the four-leaf clover to the dense-chain packing, pointing out the greater stability of the dense-chain configuration. The study further emphasized how the established interactions between the Nile Red molecules are strongly influenced by the surrounding environment.

Original languageEnglish
Pages (from-to)14761-14768
Number of pages8
JournalLangmuir
Volume35
Issue number46
DOIs
Publication statusPublished - 26-Oct-2019
Externally publishedYes

Keywords

  • SOLVATOCHROMIC DYE
  • LIPID-CONTENT
  • STEADY-STATE
  • MIXTURES
  • POLARITY
  • LIQUIDS
  • GROWTH
  • CELLS
  • PROBE

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