Isolated heterometallic Cr7Ni rings grafted on Au(111) surface

Valdis Corradini, Roberto Biagi, Umberto Del Pennino, Valentina De Renzi, Alessandro Gambardella, Marco Affronte, Christopher A. Muryn, Grigore A. Timco, Richard E P Winpenny

Research output: Contribution to journalArticlepeer-review

Abstract

A study of the deposition of heterometallic antiferromagnetically coupled rings onto gold surfaces is reported. Two new {Cr7Ni} rings, [NH 2 nPr2][Cr7NiF8(3-tpc) 16] (1) (where 3-tpc = 3-thiophenecarboxylate) and [ nBuNH2CH2CH2SH] [Cr 7NiF8(O2CtBu)16] (2) have been made and structurally characterized. They have been deposited from the liquid phase on Au(111) and the adsorbed molecules compared by means of scanning tunneling microscopy (STM) and X-ray photoemission spectroscopy (XPS). In both cases a two-dimensional distribution of individually accessible {Cr 7Ni} heterometallic rings on the gold surface has been obtained, exploiting the direct grafting of sulfur-functionalized clusters. There is a competition between the chemisorption of the {Cr7Ni} clusters and a thiolic self-assembled monolayer (SAM) formed by free ligands. In 2, the presence of a single sulfur ligand should force the molecule to graft with the ring axis normal to the surface. The cluster stability in the STM images and the S-2p energy positions demonstrate, for both functionalizations, the strength of the grafting with the gold surface.

Original languageEnglish
Pages (from-to)4937-4943
Number of pages7
JournalInorganic Chemistry
Volume46
Issue number12
DOIs
Publication statusPublished - Jun 11 2007

ASJC Scopus subject areas

  • Inorganic Chemistry

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