Metallization of ultra-thin, non-thiol SAMs with flat-lying molecular units: Pd on 1, 4-dicyanobenzene

Chemphyschem. 2010 Sep 10;11(13):2951-6. doi: 10.1002/cphc.201000309.

Abstract

Self-assembled monolayers of 1,4-dicyanobenzene on Au(111) electrodes are studied by cyclic voltammetry, in-situ STM and ex-situ XPS. High-resolution STM images reveal a long-range order of propeller-like assemblies each of which consists of three molecules, all lying flat on the gold substrate with the cyano groups oriented parallel to the metal surface. It is demonstrated that both functional groups can act as complexation sites for metal ions from solution. Surprisingly, such arrangements still allow the metal to be deposited on top of the molecules by electrochemical reduction despite the close vicinity to the Au surface. The latter is demonstrated by angle-resolved XPS which unequivocally shows that the metal indeed resides on top of the organic layer rather than underneath, despite the flat arrangement of the molecules.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cyanides / chemistry*
  • Electrochemistry
  • Electrodes
  • Gold / chemistry
  • Membranes, Artificial*
  • Palladium / chemistry*
  • Particle Size
  • Surface Properties

Substances

  • Cyanides
  • Membranes, Artificial
  • Palladium
  • 1,4-dicyanobenzene
  • Gold