Dipodal ferrocene-based adsorbate molecules for self-assembled monolayers on gold

Tobias Weidner, Nirmalya Ballav, Michael Zharnikov, Andreas Priebe, Nicholas J. Long, Jörg Maurer, Rainer Winter, Alexander Rothenberger, Dieter Fenske, Dag Rother, Clemens Bruhn, Heinrich Fink, Ulrich Siemeling*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

1,1′-Difunctionalised ferrocene derivatives have been studied, which contain groups suitable for chemisorption on gold substrates, namely -NC, -PR2 as well as a range of sulfur-containing units like -NCS, -SR, and thienyl. Thin films on gold have been fabricated from solution with most of these adsorbate species. Film thickness, composition and structure were investigated primarily by X-ray photoelectron and near-edge X-ray absorption fine-structure spectroscopy. The quality of self-assembled monolayers fabricated from 1,1′-diisocyanoferrocene (1) and 1,1′- diisothiocyanatoferrocene (2) turned out to be superior to that of films based on the other adsorbate species investigated. In addition to the surface coordination behaviour of 1 towards gold substrates, relevant aspects of the molecular coordination chemistry of 1 have also been addressed, including the synthesis and characterisation of [(μ-1){Cr(CO)5}2], [Ag2(μ-1)2](NO3)2·H2O and [(μ-1)-(AuCl)2]. The crystal structure of the gold complex is governed by aurophilic interactions and can be taken as a model for the arrangement of 1 in self-assembled monolayers on gold.

Original languageEnglish (US)
Pages (from-to)4346-4360
Number of pages15
JournalChemistry - A European Journal
Volume14
Issue number14
DOIs
StatePublished - May 9 2008

Keywords

  • Aurophilicity
  • Iron
  • NEXAFS spectroscopy
  • S ligands
  • Thin films

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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