Correlation of Ionisation Constants of Organic Acids with Dipole Moments

Abstract

SINCE ionization constants and dipole moments are both measures of polarity, it is logical to suppose that a connexion will exist between them. Interesting results have followed an examination of the elementary possibility that the difference between the strengths of substituted and unsubstituted acids in the benzoic and phenylacetic series, and the dipole moments of monosubstituted benzenes (virtually the substituent groups), are simply related. The ionization constant values (K_therm) were all derived in this Department and the dipole moments were those employed by Dippy and Watson¹ in connexion with the log arithmic relationship observed previously. These sets of data possess the advantage of being comparable.