Abstract
AbstractOligosilsesquioxanes (OSS) may be considered as molecular sections of silica. The incompletely condensed (cy‐clopentyl)7T7(OH)3 (T = SiO3/2) has been used to generate a phosphine‐functionalized T8‐OSS system by reaction with 2‐(trichlorosilyl)diphenylphosphinoethane. The resulting model molecule (cyclopentyl)7T8(CH2)2PPh2 (1) is well suited to coordinate to transition metal clusters via the phosphorous atom. We selected the tetrahedral bimetallic cluster [HFeCo3‐(CO)12]. Depending on the stoichiometry, one or two phosphine ligands could be added to the cobalt atoms, with substitution of CO molecules. Owing to the cyclopentyl substituents, the resulting complexes [HFeCo3(CO)11{Ph2P(CH2)2T8‐(cyclopentyl)7}] (2) and [HFeCo3‐(CO)10{Ph2P(CH2)2T8(cyclopentyl)7}2] (3) are soluble in numerous organic solvents. Therefore, they could be completely characterized by 1H, 13C, 29Si, and 31P NMR spectroscopy.
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