Abstract
Systematic determination of Fe-P bond lengths for the set of complexes (η-Cp)(CO)(L)FeCOMe containing «sterically unencumbered» σ-donor phosphorus(III) ligands shows that the Fe-P bond lengths vary over a narrow range (2.195±0.0015 A) and are only slightly dependent on the σ-donicity and size of the ligand. π-Acid ligands (i.e. P(OR) 3 ) exhibit significantly shorter Fe-P bond lengths around 2.10 A. In light of this virtual constancy of σ bond length for a family of complexes, it is reasonable to expect steric thresholds to be manifest
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