Effect of mass distribution on the isotopic thermal diffusion of substituted benzenes

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Abstract
Isotopic thermal diffusion factors for chlorobenzene and bromobenzene were measured in a 45 cm liquid phase thermal diffusion column. The data, combined with results obtained earlier for deuterium and 13C substituted benzenes, were interpreted in terms of differences in molecular masses and moments of inertia. The results for five isotopic pairs were represented within experimental accuracy by αT=1.973 (m1−m2)/(m1+m2)+0.973 (I1−I2)/(I1+I2), where αT is the thermal diffusion factor, m1 and m2 are the molecular masses, and I1 and I2 are second moments.