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Two-dimensional molecular patterning by surface-enhanced Zn-porphyrin coordination

  • Johan Visser
  • , Nathalie Katsonis
  • , Javier Vicario
  • , Ben Feringa
  • Stratingh Institute, University of Groningen

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

In this contribution, we show how zinc-5,10,15,20-meso-tetradodecylporphyrins (Zn-TDPs) self-assemble into stable organized arrays on the surface of graphite, thus positioning their metal center at regular distances from each other, creating a molecular pattern, while retaining the possibility to coordinate additional ligands. We also demonstrate that Zn-TDPs coordinated to 3-nitropyridine display a higher tendency to be adsorbed at the surface of highly oriented pyrolytic graphite (HOPG) than noncoordinated ones. In order to investigate the two-dimensional (2D) self-assembly of coordinated Zn-TDPs, solutions with different relative concentrations of 3-nitropyridine and Zn-TDPAere prepared and deposited on the surface of HOPG. STM measurements at the liquid-solid interface reveal that the ratio of coordinated Zn-TDPs over noncoordinated Zn-TDPs is higher at the n-tetradecane/HOPG interface than in n-tetradecane solution. This enhanced binding of the axial ligand at the liquid/solid interface is likely related to the fact that physisorbed Zn-TDPs are better binding sites for nitropyridines.
Original languageEnglish
Pages (from-to)5980 - 5985
Number of pages6
JournalLangmuir
Volume25
Issue number10
DOIs
Publication statusPublished - 2 Apr 2009
Externally publishedYes

Keywords

  • zink-5,10,15,20-meso-tetradodecylporfyrinen
  • self-assemble
  • surfaces
  • interfaces
  • ligands
  • monolayers
  • pyrroles
  • scanning tunneling microscopy

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