Synthesis and characterization of ferrocenyl-modified mesoporous silicates
The mesoporous silicates MCM-41 and FSM-16 have been functionalized with a range of ferrocenyl groups. The general synthetic methodology involves either reaction of the strained [1]ferrocenophanes [Fe(η-C5R4)2SiMe2] (R = H or Me), [Fe(η-C9Me6)(η-C5H 4)SiMe2], or the ferrocenyl carbocation [Fe(η-C5Me...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1998
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| Summary: | The mesoporous silicates MCM-41 and FSM-16 have been functionalized with a range of ferrocenyl groups. The general synthetic methodology involves either reaction of the strained [1]ferrocenophanes [Fe(η-C5R4)2SiMe2] (R = H or Me), [Fe(η-C9Me6)(η-C5H 4)SiMe2], or the ferrocenyl carbocation [Fe(η-C5Me5)(η-C5Me4CH 2)]+ with the dehydrated mesoporous silicate. The materials have been extensively characterized by (inter alia) solid-state 13C and 29Si NMR and Fe K-edge EXAFS spectroscopy. The reaction of either [Fe(η-C5H4)2SiMe2] or [Fe(η-C5Me4)2SiMe2] with MCM-41 affords both single ferrocenyl and short chain oligo(ferrocenyl) units grafted to the silicate walls of the mesopores. In contrast, the reaction of [Fe(η-C9-Me5)(η-C5H 4)SiMe2] with MCM-41 gives only a single type of ferrocenyl group attached to the pore walls via a regiospecific ring-opening reaction in which the Si-(C5H4) bond is broken in preference to the Si-(C9Me6) bond. © 1998 American Chemical Society. |
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