Fourier-transform nuclear magnetic resonance measurements of self-diffusion in the 1,1,2,2-tetrabromoethane + n-alkylbenzene system. Comment on approximate hydrodynamic models for the interpretation of diffusion data

Abstract

The self-diffusion behaviour of 5% 1,1,2,2-tetrabromoethane and solvent, a homologous series of n-alkylbenzenes (benzene–pentadecylbenzene), has been investigated and compared with literature data for interdiffusion in the same system. The agreement between these sets of data is very good. In addition, a consideration of the relative diffusion behaviour for solvent and solute has helped to elucidate the mechanism for transport in solution. Previous interpretations of the diffusion data in terms of modified forms of the Stokes–Einstein equation are discussed.