Abstract
The (benzylideneacetone)Fe(CO) 2L complexes, with L = CO, PPh 3, PMePh 2, PMe 2Ph, PEt 3, PCy 3, P(OPh) 3, P(OMe) 3, P(OEt) 3 and P(O iPr) 3 have been studied by Mössbauer spectroscopy. The spectra are compatible with a distorted octahedral geometry with the iron atom at the center. The isomer shifts δ and quadrupole splittings Δ E q are correlated with the Giering electronic parameter χ d of the phosphines and phosphites and with the 13C NMR complex shifts ΔC 4 of coordinated benzylideneacetone. The results are discussed in terms of the stereoelectronic effects of the ligand L. Correlation between isomer shifts and quadrupole splittings indicates that dπ-Lπ★ back bonding is predominant in the complexes with L = CO and phosphites and negligible in the complexes with L = phosphines.
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