Summary
Qualitative molecular orbital considerations of the complexes [η5-CPV(CO)3 L] (L = substituted phosphane, SbPh3, AsPh3, CN−) suggest that s' V chemical shift parameters (τ) obtained for these compounds should correlate with the π-acceptor abilities of L. Based on observed r-values, the ligands are arranged in sequence of their π-acceptor ability, which lies in the order P(OR)3 > CN− > PR'33 ∼ SbPh3 ∼ PPhF2 > P(i-Bu)3 ∼ P(NR ″2 )3 > PPh3 > AsPh3 Nuclear spin-spin coupling constants J (51V-31 P), line widths Δ H and i.r. data in the ν(CO) region are also presented.
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P(OR)3 = P(OEt)3, 4-Ethyl-l-phospha-2,6,7-trioxabicyclo[2.2.2]-octane; R′ = Me, n-Pr; R″ = Me, Et.
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Rehder, D., Dorn, W.L. & Schmidt, J. A π-acceptor series for phosphines from51V N.M.R. data on [η5-CpV(CO)3L] complexes. Transition Met Chem 1, 74–76 (1976). https://doi.org/10.1007/BF01385946
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DOI: https://doi.org/10.1007/BF01385946