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Abstract
PMR benzene solvent shifts Δδ [δ(CCl4)δ(C6D6)] have been measure for β-diketonate group protons of isomeric hexacoordinate dichlorodiarylantimony(V) β-diketonates. The observed solvent shifts are interpreted on the basis of a non-specific tangential approach of the benzene molecules to the electron-deficient sites of the solute. An inductive substituent constant σ1 of 0.48 has been deduced for the 2,2′-biphenylylene group.PMR benzene solvent shifts Δδ of the various protons in the two isomers of p-Tol2SbCl2Acac are not markedly different and do not allow a conclusion concerning the geometry of the isomers, which is, however, easily assigned on the basis of aromatic ring current effects.
Published Version
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