An extension of the linear relationship between molecular rotation and bond refraction

Abstract

The usefulness of the empirical equation [M]_D = mΣR_D+I, first proposed by Davis and Jensen, in the correlations of the molecular rotations of series of structurally closely related compounds was originally limited to monovalent and linear substituents ([M]_D is the molecular rotation, ΣR_D is the sum of bond refractions, and m and I are constants for a given series of compounds). A different treatment of the term ΣR_D extends the usefulness of the equation to all types of substituents.