Abstract
The formation constants of complexes of iodine with 11 meta- and para-substituted acetophenones are reported for heptane solutions at 25° and correlated by various linear free energy relationships. Neither σ, σ+, or a combination of σ0(or σn) and σ+ satisfactorily correlate the data. Dual substituent parameter equations furnish better results and show that the effects of meta-substituents are not of the σ0 type whilst those of para-substituents are of the σR+ type. The Thirot equation gives the best empirical fit to the data.
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