NMR study of (C6H5)3-nPXn (X = Cl,Br, I; n = 0-3) and (C6H6)3-n PXnCr(CO)5 compounds |
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Authors: | E. Vincent L. Verdonck G.P. Van Der Kelen |
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Affiliation: | Laboratory for General and Inorganic Chemistry-B, University of Gent, Krijgslaan 271, B-9000 GentBelgium |
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Abstract: | The 31P chemical shift of the (C6H5)3-nPXn ligands (X = Cl, Br, I; n = 0–3) is dominated by the electronegativity of the substituents. π bonding is only important for derivatives with three strongly electronegative substituents. The 31P chemical shift of the corresponding complexes (C6H5)3-nPXnCr(CO)5 is governed by the simultaneous effects of the electronegativity, steric hindrance and π bonding. The resonance parameter, δ', indicates an increasing (pring → dp)π and (dcr→ dp)π electron delocalization with halogen substitution. |
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