Self-assembled monolayer of organic iodine on a Au surface for attachment of redox-active metal clusters

Ying Yu, Manish Dubey, Steven L. Bernasek, G. Charles Dismukes

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The attachment of a bifunctional iodo-organo-phosphinate compound to gold (Au) surfaces via. chemisorption of the iodine atom is described and used to chelate a redox-active metal cluster via the phosphinate group. XPS, AFM, and electrochemical measurements show that (4-iodo-phenyl)phenyl phosphinic acid (IPPA) forms a tightly bound self-assembled monolayer (SAM) on Au surfaces. The surface coverage of an IPPA monolayer on Au was quantified by an electrochemical method and found to be 0.40 ± 0.03 nmol/cm 2, roughly corresponding to 0.4 monolayers. We show that the Au/IPPA SAM, but not the underivatized Au, adsorbs Mn 4O 4(Ph 2PO 2) 6 from solution by a phosphinate exchange reaction to yield Au/IPPA/Mn 4O 4(Ph 2PO 2) 5 SAM. The resulting SAM is firmly bound and not removed by sonication, as confirmed by manganese XPS (Mn 2p 1/2) and by AFM. Electrochemistry confirms that Mn 4O 4(Ph 2-PO 2) 6 is anchored on the Au/IPPA surface and that redox chemistry can be mediated between the electrode and the surface-attached complex. Mn 4O 4(Ph 2PO 2) 6 contains the reactive Mn 4O 4 6+ cubane core, a redox-active bioinspired catalyst.

Original languageEnglish
Pages (from-to)8257-8263
Number of pages7
JournalLangmuir
Volume23
Issue number15
DOIs
Publication statusPublished - Jul 17 2007

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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