NDLI: Grafting and Thermal Stripping of Organo-Bimetallic Clusters on Au Surfaces: Toward Controlled Co/Ru Aggregates

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Grafting and Thermal Stripping of Organo-Bimetallic Clusters on Au Surfaces: Toward Controlled Co/Ru Aggregates

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Braunstein, Pierre Naitabdi, Ahmed Rosé, Jacky Toulemonde, Olivier Bucher, Jean Pierre Welter, Richard Drillon, Marc
Description	Author Affiliation: Naitabdi A ( Institut de Physique et Chimie des Matériaux de Strasbourg UMR 7504 CNRS Université Louis Pasteur, 23 rue du Loess, 67037 Strasbourg, France.)
Abstract	The controlled stoichiometry of heterometallic carbonyl clusters make them attractive precursors for the stabilization of bare metal alloy clusters for magnetic applications. The mixed-metal molecular cluster $[RuCo_{3}(H)(CO)_{12}]$ has been functionalized with the phosphane–thiol ligand $Ph_{2}PCH_{2}CH_{2}SH$ to allow subsequent anchoring on a gold surface. The resulting tetrahedral cluster $[RuCo_{3}(H)(CO)_{11}(Ph_{2}PCH_{2}CH_{2}SH)]$ (1) has been characterized by X-ray diffraction and the P-monodentate ligand is axially bound to a cobalt center and trans to the ruthenium cap. This synthesis also yielded the product of oxidative coupling, in which two SH groups were coupled intermolecularly to give a disulfide ligand that links two tetrahedral cluster units in $[\{RuCo_{3}(H)(CO)_{11}(Ph_{2}PCH_{2}CH_{2}S)\}_{2}]$ (2). This cluster has also been characterized by X-ray diffractions studies. After deposition of 1 on a Au(111) surface by self-assembly, the carbonyl ligands were stripped off by thermal annealing in ultra-high vacuum (UHV) to form a metallic species. X-ray photoelectron spectroscopic measurements performed as a function of the annealing temperature show that the cobalt and ruthenium centers converge towards metallic character and that the stoichiometry of the alloy is retained during the annealing process. Preliminary X-ray absorption spectroscopy (XAS) synchrotron experiments indicate that clusters 1 and 2 behave similarly, which is consistent with the retention of their tetrahedral units on the gold surface after transformation of the thiol function or breaking of the disulfide bond to form AuS bonds, respectively, has occurred.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	8
Volume Number	14
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2008-01-01
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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