For a series of alkyl radicals we have measured the electron g factors and hfs splitting constants by EPR methods. The isotropic chlorine hfs constants are discussed in terms of the Karplus-Fraenkel formula αCl=QCClClQc. The results indicate that QCl = Δ (Cl) QCπ with Δ (Cl) =0.16. From this and Fischer’s Δ (Xi) parameters for the other substituents, effective σ-π-parameters could be determined to be
There exists a proportional relationship between the g factor shift ΔgCl due to chlorine substituents and ClΣ QClπ from which ΔEn→πCl =15.6·103 cm-1 was determined. CI
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