ISSN:
0947-6539
Keywords:
clusters
;
catalyst models
;
oligo-silsesquioxanes
;
silica
;
supported complexes
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Oligosilsesquioxanes (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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/chem.19970030611
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