Diffusion of dioxygen in 1-alkenes and biphenyl in perfluoro-n-alkanes

The translational diffusion constant, D, has been measured for O2 in the even 1-alkenes 1-C6H12 to 1-C16H32 and biphenyl in n-C6F14 and n-C9F20. Deviations from the Stokes–Einstein relation were found; the use of D/T=A/ηp gave p=0.560±0.017 for O2 in the 1-alkenes, the same (within experimental error) as found previously for O2 in the n-alkanes. The charge transfer (CT) transition used to detect O2 in the 1-alkenes is at 220 nm. The D values for biphenyl in the perfluoro-n-alkanes (PFAs) are consistent with those in the n-alkanes, where p=0.718±0.004. These results suggest that O2 has similar solute–solvent interactions in both the 1-alkenes and n-alkanes as does biphenyl in the n-alkanes and PFAs.