The Dipole Moments of Certain Monosubstituted Benzenes in the Vapor State

Abstract

The dielectric constants of the vapors of three monosubstituted benzenes have been determined over a range of temperature and used to calculate dipole moments as follows: fluorobenzene, 1.57×10-18; chlorobenzene, 1.70×10-18; nitrobenzene, 4.19×10-18. These values are considerably higher than those found from previous measurements in solution and agree well with values calculated for the vapor state by the application of an empirical equation developed by Müller to measurements in solution.