Ir-Sn bimetallic silica-based materials have been prepared via deposition of the molecular organometallic clusters (NEt 4 ) 2 [Ir 4 (CO) 10 (SnCl 3 ) 2 ] and NEt 4 [Ir 6 (CO) 15 (SnCl 3 )] or via deposition of Sn organometallic precursor Sn(n-C 4 H 9 ) 4 onto pre-formed Ir metal particles. These solids possess promising properties, in terms of selectivity, as catalysts for propane dehydrogenation to propene. Detailed CO-adsorption DRIFTS, XANES and EXAFS characterization studies have been

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... med on these systems in order to compare the structural and electronic evolution of systems in relation to the nature of the Ir-Sn bonds present in the precursor compounds and to propose a structural model of the Ir-Sn species present at the silica surface of the final catalyst. † Dedicated to the memory of Dr