Abstract
The bimetallic clusters (μ 2-H)AuOs 3(CO) 10PPh 3 (I) and (μ 2-Cl)AuOs 3-(CO) 10PPh 3 ( II) were anchored intact onto phosphine-functionalized silica by phosphine-phosphine ligand exchange. CO could be added reversibly at room temperature onto the electronically unsaturated, immobilized cluster I. The addition reaction was accompanied by metal-metal bond opening. Alkenes were not added. At higher temperatures, cluster fragmentation occurred, which finally led to gold particle aggregation and tri- and mono-nuclear osmium complexes. No structural changes were observed for immobilized cluster II on exposure to CO, C 2H 4 and H 2. Weak coordination of electron-donor molecules probably occurs at the Au atom in the open-butterfly structure of this cluster. Thermal stability of the immobilized cluster II is low, and its fragmentation again leads to small gold particles and tri- and mononuclear osmium complexes.
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