STM imaging of a heptanuclear ruthenium (II) dendrimer, mono-add layer on graphite

Loredana Latterini, Geoffrey Pourtois, Cécile Moucheron, Roberto Lazzaroni, Jean-Luc Bredas, Andrée Kirsch-De Mesmaeker, Frans C. De Schryver*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Scanning tunneling microscopy (STM) and molecular mechanics calculations were used to investigate the long-range packing and the structure of an heptanuclear ruthenium (II) dendritic species, as a PF6- salt. STM imaging was carried out on a mono-add layer of the ruthenium dendrimer formed by physisorption from a 1,2,4-trichlorobenzene solution at the liquid-graphite interface. The packing of the molecules on the surface was visualised by the formation of ordered patterns and a distance of 27 ± 2 Å was measured between two adjacent lamellae. The comparison of this dimension with the molecular-modelling data indicates that the lamellae were formed by rows of dendrimer molecules in which the counterions (PF6-) were strongly associated with the Ru atoms. The images acquired with higher spatial resolution revealed the presence of repeating units within the lamellae. The comparison of the STM images with the modelling results allowed the attribution of the repeating units observed in the imaged pattern to the STM signature of single dendrimer molecules.

Original languageEnglish (US)
Pages (from-to)1331-1336
Number of pages6
JournalChemistry - A European Journal
Volume6
Issue number8
StatePublished - Apr 14 2000

Keywords

  • Dendrimers
  • Modelling
  • Ruthenium
  • Scanning probe microscopy

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Organic Chemistry

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