Photochemistry of methyl- and acetyl-dicarbonyl(η-cyclopentadienyl)-iron in frozen gas matrices at 12 K. Infrared spectroscopic evidence for the formation of tricarbonyl(η-cyclopentadienyl)methyliron and acetylmonocarbonyl(η-cyclopentadienyl)iron
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 12,p. 2311-2316
- https://doi.org/10.1039/dt9810002311
Abstract
Infrared spectroscopic evidence is presented to show that, on photolysis of [Fe(η5-C5H5)(CO)2(CH3)] at high dilution in CO matrices at 12 K, a new species [Fe(η3-C5H5)(CO)3(CH3)] is produced. No evidence has been found for the formation of [Fe(η5-C5H5)(CO)(CH3)] in Ar, CH4, and N2 matrices nor [Fe(η5-C5H5)(CO)2(COCH3)] in Co matrices, although in 13CO-doped matrices rapid exchange was observed. Wavelength-selective photolysis of [Fe(η5-C5H5)(CO)2(COCH3)] in Ar, CH4, and CO matrices produces [Fe(η5-C5H5)(CO)2(CH3)]via the co-ordinatively unsaturated intermediate [Fe(η5-C5H5)(CO)(COCH3)]. The rapid exchange of 12CO ligands in [Fe(η5-C5H5)(CO)2(CH3)] with 13CO in the matrix, the expanded-co-ordination-number species [Fe(η3-C5H5)(CO)3(CH3)], and the co-ordinatively unsaturated species [Fe(η5-C5H5)(CO)(COCH3)] are discussed in relation to the mechanisms of the insertion reactions of [Fe(η5-C5H5)(CO)2(CH3)] and the thermal and photochemical decarbonylation reactions of [Fe(η5-C5H5)(CO)2(COCH3)].Keywords
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