Journal
ORGANOMETALLICS
Volume 26, Issue 25, Pages 6354-6365Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om7006425
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- Engineering and Physical Sciences Research Council [EP/E005152/1] Funding Source: researchfish
- EPSRC [EP/E005152/1] Funding Source: UKRI
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A library of iron(0) tricarbonyl complexes containing eta(4) -bound alpha,beta-unsaturated enone ligands [Fe-(CO3(eta(4)-RCH=CH-C{Ph}=O)] has been prepared to facilitate comprehensive correlation of the electronic withdrawing/donating properties of the substituent, R, with the strength of the metal-ligand interaction. The IR and NMR spectroscopic data proved invaluable in aiding a comprehensive correlation and global understanding of the aryl substituent effects. The frequency of the M-CO bands in the infrared spectra of these species exhibits a linear correlation with the Hammett parameters for the substituents. The coordination shifts in both the H-1 and C-13 NMR spectra for the ligands exhibit a similar linear relationship. The largest coordination shifts are observed when more electron-withdrawing groups are present, implying that the organic ligand is primarily acting as a pi-acid. The structures of six complexes of this type have been determined by single-crystal X-ray diffraction.
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