Frequency dependence of the product of molecular susceptibility and molecular dipole moment

The products of molecular susceptibilities and molecular dipole moments of nine organic nonlinear optical materials were evaluated by suggesting an expression using the solvatochromism procedure. The data were plotted versus the frequency factor F (ω). Another 51 pairs of data abstracted from separate literature were treated in a similar way. A fairly good linear relationship and, more interestingly, a rather small slope variation were observed in spite of the wide difference in chemical constitution and different measurement methods used.