Abstract
Tetracarbonyldichlororhodium(I) [Rh(CO)2(μ -Cl)]2 entrapped in faujasite type zeolites reacted with phosphines PMe3- xPhx at 393-463 K to a different extent. Although according to computational studies phosphines with x<2 should be small enough to enter the micropore system, the reaction was in no case complete and led to a mixture of products as observed by IR spectroscopy. Furthermore surface-bonded rhodium carbonyl complexes were synthesized in mesoporous aluminium-containing MCM-41 material by reacting acetylacetonatodicarbonylrhodium(I) [Rh(acac)(CO)2] with Brønsted-acidic centers under formation of a chemically bonded [Rh(CO)2]- species and acetylacetone according to IR spectroscopy. The corresponding surface-bonded phosphine complex [(Os)x-Rh(chiraphos)] was synthesized and identified with IR and 31P MAS NMR spectroscopy.
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Janssen, A., Niederer, J. & Hoëlderich, W. Investigation of rhodium complexes in micro- and mesoporous materials by computer modeling, FTIR, and 31P MAS NMR. Catalysis Letters 48, 165–171 (1997). https://doi.org/10.1023/A:1019043508034
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DOI: https://doi.org/10.1023/A:1019043508034